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15 Years of Experience in Coaching & Tutoring Math, Java, Mandarin
Charles Chiaho C.

5.0 (1,011 ratings)

3,694 hours tutoring

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About Charles Chiaho

Bio

I bring 15 years of experience coaching and tutoring Math for all types of standardized tests, homework help, and test/quiz prep. I also provide practice tests and personalized curricula to achieve the best possible results through efficient, targeted learning.

I excel at helping my students understand math in a clear and encouraging way. I walk them through problems step-by-step, pinpoint weaker or missing concepts, and strengthen them immediately. I don't just cover concepts in...

I bring 15 years of experience coaching and tutoring Math for all types of standardized tests, homework help, and test/quiz prep. I also provide practice tests and personalized curricula to achieve the best possible results through efficient, targeted learning.

I excel at helping my students understand math in a clear and encouraging way. I walk them through problems step-by-step, pinpoint weaker or missing concepts, and strengthen them immediately. I don't just cover concepts in isolation; I make sure they understand how different concepts connect and how to choose the right ones to solve problems.

For test prep, I have a large collection of practice tests at different difficulty levels so my students can build skill, confidence, and test readiness.

For honors or advanced-level classes, I further teach advanced problem-solving strategies and techniques to help my students stay at the top of the class.

My strong and extensive teaching experience will help you excel and stand out from the crowd!

Standardized Tests I coach:
SAT, PSAT, ACT, ISEE, SSAT, HESI, DAT, High School Placement Test, Regents, COOP/HSPT, SHSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS.

Subjects I tutor:
All math classes for high school & middle school, Calculus, AP Computer Science, Java, Mandarin Chinese.

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Education

Bachelor of Science - University of Washington
Electrical Engineering

Additional Languages

Mandarin Chinese

Policies

  • Hourly Rate: $50
  • Rate details: 1 hour minimum per session. No free trial sessions. Discounted group rates available.
  • Lesson cancellation: 12 hours notice required

  • Background check passed on 5/10/2017

  • Your first lesson is backed by our Good Fit Guarantee

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Approved Subjects

ACT Math

ACT Math

I've successfully helped numerous students raise their ACT math scores by 30 - 50% in 1 to 2 months (10 - 15 sessions), especially those who put in the diligent hard work following my plan. I've successfully helped numerous students raise their SAT math scores by 50 - 150 points and ACT math by 30% - 50% in 1 to 2 months (10 - 15 sessions), especially those who put in diligent hard work following my plan. During the first few sessions, I will evaluate each of my student's math level and learning style and come up with a personalized lesson plan. The lesson plan will be adjusted whenever I see a need to best fit students' learning progress. I use diverse teaching methods because each student comes with unique math background, learning style, and pace. For students struggling with math, I will focus on rebuilding their foundational knowledge and reinforcing difficult areas. For students already excelling in math, I will teach them advanced problem-solving techniques, as well as how to tackle unfamiliar or never-seen-before problems. Most important of all, we all understand practice is the key to success in math. In order to get a decent score, we must practice as many different problem types as possible so that we increase the chance of seeing similar or even identical problems on the actual test. Also, practicing strengthens our knowledge and sharpens our skills, which helps us to solve problems more quickly and accurately, even under stress. In general, depending on students' math proficiency and the length of prep time, I will conduct a personalized comprehensive review to build a solid foundation in math, and then work toward getting a decent or perfect score.
Algebra 1

Algebra 1

I excel at helping my students understand math in a clear and encouraging way. I walk them through problems step-by-step, pinpoint weaker or missing concepts, and strengthen them immediately. I don't just cover concepts in isolation; I make sure they understand how different concepts connect and how to choose the right ones to solve problems. For honors or advanced-level classes, I further teach advanced problem-solving strategies and techniques to help my students stay at the top of the class. Honor Algebra 1 GPA: 4.0.
Algebra 2

Algebra 2

I excel at helping my students understand math in a clear and encouraging way. I walk them through problems step-by-step, pinpoint weaker or missing concepts, and strengthen them immediately. I don't just cover concepts in isolation; I make sure they understand how different concepts connect and how to choose the right ones to solve problems. For honors or advanced-level classes, I further teach advanced problem-solving strategies and techniques to help my students stay at the top of the class. Honor Algebra 2 GPA: 4.0.
Calculus

Calculus

I excel at helping my students understand math in a clear and encouraging way. I walk them through problems step-by-step, pinpoint weaker or missing concepts, and strengthen them immediately. I don't just cover concepts in isolation; I make sure they understand how different concepts connect and how to choose the right ones to solve problems. For honors or advanced-level classes, I further teach advanced problem-solving strategies and techniques to help my students stay at the top of the class. AP Calculus BC Score: 5/5
CBEST

CBEST

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
Chinese

Chinese

I provide a systematic way to help my student memorize vocabularies (Simplified & Traditional) as well as different teaching methods according to students' needs and level of proficiency. I can teach lessons in northern accent(Standard Chinese) or southern accent as your choice. I was born and raised in Taiwan and came to Seattle at the age of 16. Therefore I am not only fluent in Mandarin Chinese, but also in English which help me teach more effectively.
CLAST

CLAST

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
COOP/HSPT

COOP/HSPT

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
DAT (Dental)

DAT (Dental)

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
Geometry

Geometry

I excel at helping my students understand math in a clear and encouraging way. I walk them through problems step-by-step, pinpoint weaker or missing concepts, and strengthen them immediately. I don't just cover concepts in isolation; I make sure they understand how different concepts connect and how to choose the right ones to solve problems. For honors or advanced-level classes, I further teach advanced problem-solving strategies and techniques to help my students stay at the top of the class. Honor Geometry GPA: 4.0.
HESI (Nursing exam)

HESI (Nursing exam)

I've coached more than 220 students in MATH for the HESI Nursing Exam. I excel at breaking down complex math concepts into clear and manageable steps, and I teach both essential foundations and advanced problem-solving strategies. To achieve the best result, I have a large collection of practice tests at different difficulty levels so my students can build skill, confidence, and test readiness.
High School Placement Test

High School Placement Test

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
ISEE

ISEE

I've coached more than 350 students in MATH for the ISEE Exam. I excel at breaking down complex math concepts into clear and manageable steps, and I teach both essential foundations and advanced problem-solving strategies. To achieve the best result, I have a large collection of practice tests at different difficulty levels so my students can build skill, confidence, and test readiness.
Java

Java

I've tutored Java since college. Programming can be challenging when a logic is stuck and you have no idea where to start in order to solve it. That is the time when I jump in to help. No matter if you are taking a CS class or doing a project on your own, I can not only help you walk through and get the problem done but also help you think through the logic and algorithm. I once struggled with learning programming myself, so I know how to help someone who is stuck in the learning process of the language. $60/hr
Precalculus

Precalculus

I excel at helping my students understand math in a clear and encouraging way. I walk them through problems step-by-step, pinpoint weaker or missing concepts, and strengthen them immediately. I don't just cover concepts in isolation; I make sure they understand how different concepts connect and how to choose the right ones to solve problems. For honors or advanced-level classes, I further teach advanced problem-solving strategies and techniques to help my students stay at the top of the class. Honor Precalculus GPA: 4.0.
PSAT

PSAT

I've successfully helped more than 500 students raise their PSAT/SAT math scores by 50 - 150 points in 1 to 2 months (10 - 15 sessions), especially those who put in diligent hard work following my plan. During the first few sessions, I will evaluate each of my student's math level and learning style and come up with a personalized lesson plan. The lesson plan will be adjusted whenever I see a need to best fit students' learning progress. I use diverse teaching methods because each student comes with unique math background, learning style, and pace. For students struggling with math, I will focus on rebuilding their foundational knowledge and reinforcing difficult areas. For students already excelling in math, I will teach them advanced problem-solving techniques, as well as how to tackle unfamiliar or never-seen-before problems. Most important of all, we all understand practice is the key to success in math. In order to get a decent score, we must practice as many different problem types as possible so that we increase the chance of seeing similar or even identical problems on the actual test. Also, practicing strengthens our knowledge and sharpens our skills, which helps us to solve problems more quickly and accurately, even under stress. In general, depending on students' math proficiency and the length of prep time, I will conduct a personalized comprehensive review to build a solid foundation in math, and then work toward getting a decent or perfect score.
Regents

Regents

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
SAT Math

SAT Math

I've successfully helped numerous students raise their SAT math scores by 50 - 150 points in 1 to 2 months (10 - 15 sessions), especially those who put in diligent hard work following my plan. During the first few sessions, I will evaluate each of my student's math level and learning style and come up with a personalized lesson plan. The lesson plan will be adjusted whenever I see a need to best fit students' learning progress. I use diverse teaching methods because each student comes with unique math background, learning style, and pace. For students struggling with math, I will focus on rebuilding their foundational knowledge and reinforcing difficult areas. For students already excelling in math, I will teach them advanced problem-solving techniques, as well as how to tackle unfamiliar or never-seen-before problems. Most important of all, we all understand practice is the key to success in math. In order to get a decent score, we must practice as many different problem types as possible so that we increase the chance of seeing similar or even identical problems on the actual test. Also, practicing strengthens our knowledge and sharpens our skills, which helps us to solve problems more quickly and accurately, even under stress. In general, depending on students' math proficiency and the length of prep time, I will conduct a personalized comprehensive review to build a solid foundation in math, and then work toward getting a decent or perfect score.
SHSAT (NY HS admissions)

SHSAT (NY HS admissions)

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
SOL

SOL

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
SSAT

SSAT

(Math only) I've coached more than 700 students in math for the SSAT. I excel at breaking down complex math concepts into clear and manageable steps, and I teach both essential foundations and advanced problem-solving strategies. To achieve the best result, I have a large collection of practice tests at different difficulty levels so my students can build skill, confidence, and test readiness. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
STAAR

STAAR

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
TAKS

TAKS

I've coached more than 500 students in math for all types of standardized exams, including the ISEE, SSAT, Regents, COOP/HSPT, SHSAT, High School Placement Test, PSAT, GED, ASVAB, and CBEST, DAT, HESI, CLAST, SIE, SOL, STAAR, and TAKS. I have extensive experience breaking down complex mathematical concepts into manageable steps. Every student can improve their score significantly with the right guidance and consistent practice. I am committed to providing the detailed support and expert techniques you need to succeed on test day.
Trigonometry

Trigonometry

I excel at helping my students understand math in a clear and encouraging way. I walk them through problems step-by-step, pinpoint weaker or missing concepts, and strengthen them immediately. I don't just cover concepts in isolation; I make sure they understand how different concepts connect and how to choose the right ones to solve problems. For honors or advanced-level classes, I further teach advanced problem-solving strategies and techniques to help my students stay at the top of the class. Honor Trigonometry GPA: 4.0.
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Ratings and Reviews

Rating

5.0 (1,011 ratings)
5 star
(985)
4 star
(20)
3 star
(2)
2 star
(1)
1 star
(3)

Reviews

Recommended, Patient Math Tutor

I was really struggling in SAT Math, I was below average and was struggling to break the 500s. I was tutored by Charles Chiaho C. for six weeks and was able to improve my score to a 640, a total of 90 points in math only! He helped me to achieve something in six weeks that I had been trying to accomplish for 2 years. I am SO thankful I chose him to be my tutor. He was always patient no matter how many times I needed to review a subject (and boy did I need to). He is great at explaining difficult and tired subjects in a way that I can easily understand. I would 10/10 recommend him as a math tutor, and I have no doubt that if given more time, we could've raised my score even higher.

Ariana, 9 lessons with Charles Chiaho

knowledgeable tutor

Charles was very patient and knowledgeable with my 14-year-old son who has been struggling with geometry. I’m really glad we found him and plan to continue working with him.

Daphne, 5 lessons with Charles Chiaho

thank you!

My son is a man of few words but after our first session he said that it really helped his understanding of the topics being covered in his pre calculus class. We will be reaching out again for another tutor session!

Laura, 1 lesson with Charles Chiaho

Clear, Calm, and Confidence-Building

Charlie’s precalculus sessions helped my daughter feel more confident and less overwhelmed. His calm approach and clear explanations made tough concepts easier to grasp. Really appreciate the steady support and thoughtful pacing.

Thaoly, 3 lessons with Charles Chiaho

great tutor!

Charles was very efficient and ensured my son was engaged the entire lesson by asking him thought-provoking questions! We will use him again!

Cena, 1 lesson with Charles Chiaho

Experienced tutor

smart, and already has access to great resources to work on together. Explains in an organized and straightforward manner. He gave me a plan on what resources to use at first until I become more knowledgeable, to work my way up to harder questions from different resources. well worth my time! thank you

Danny, 1 lesson with Charles Chiaho

Super knowledgeable and patient tutor

Charles taught my daughters new tricks and techniques for algebra 2. They learned and had fun with math at the same time. He is a wonderful tutor, patient, throughout, knowledgeable, and approachable.

Eric, 1 lesson with Charles Chiaho

Knowledgeable, reliable, patient-explains material suited to each individual student

We recommend him as a reliable and very capable tutor based on my daughters improvement in understanding and application of HS math. Which in her case is advanced algebra

Jacqueline, 3 lessons with Charles Chiaho

Knowledgeable and patient

My daughter needs help for her Honors algebra 2 quiz . He help prepare my daughter’s quiz by explaining concepts and techniques to solve a problem.He is knowledgeable and patient answering questions.My daughter is very confident taking her test. This is our first lesson with him and will definitely schedule future meetings . Thank you!

Ellyn, 1 lesson with Charles Chiaho

Best tutor for SAT Math!

Charles have been tutoring my son, Ethan for over 2 months. Ethan learns a lot every week. Charles is knowledgeable, patient and he explains concepts in a clear way that my son can understand. Thumbs up!

Barbara, 76 lessons with Charles Chiaho