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Top-Rated Math Tutor | Calculus, AMC Competitions, SAT/ACT | 15+ Year
Thomas K.

5.0 (173 ratings)

873 hours tutoring

Your first lesson is backed by our Good Fit Guarantee
Hourly Rate: $120
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Response time: 17 minutes
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About Thomas

Bio

I hold a degree in Applied Mathematics from the University of California, Berkeley, giving me a deep understanding of complex concepts and their real-world applications. I am also a Certified Math Teacher and currently pursuing my M.Ed.
Teaching & Tutoring Experience:
AOPS: Math Competition Coach and Instructor for AMC 8, AMC 10/12, and Counting & Probability, test prep.
ACE: Served eight years as a Math Teacher and Director, guiding students through Algebra, Precalculus, AP Calculus AB/BC,...

I hold a degree in Applied Mathematics from the University of California, Berkeley, giving me a deep understanding of complex concepts and their real-world applications. I am also a Certified Math Teacher and currently pursuing my M.Ed.
Teaching & Tutoring Experience:
AOPS: Math Competition Coach and Instructor for AMC 8, AMC 10/12, and Counting & Probability, test prep.
ACE: Served eight years as a Math Teacher and Director, guiding students through Algebra, Precalculus, AP Calculus AB/BC, and SAT/ACT test prep.
CL Academy: Five years tutoring Algebra, Precalculus, AP Calculus AB/BC, Competition Math (AMC), and SAT/ACT, test prep/ exam prep.
C2 Education: Delivered hybrid online and in-person instruction in Precalculus, AP Calculus AB/BC, Multivariable Calculus, SAT/ACT, and Competition Math, test prep.
Summit Charter School: Classroom Math Teacher

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Education

University of California Berkeley
Applied Mathematics
Alliance International University
Masters
  • Licensed teacher

Additional Languages

Korean

Policies

  • Hourly Rate: $120
  • Rate details: Group Sessions: For group sessions, an additional $20 per student. Notification Requirement: Request less than 12 hours before the lesson will charge the full lesson rate.
  • Lesson cancellation: 24 hours notice required

  • Background check passed on 5/20/2024

  • Your first lesson is backed by our Good Fit Guarantee

Schedule

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Approved Subjects

ACT Math

ACT Math

I have taught the ACT Math for over ten years. I took a ACT Math test and received 36. I have unique materials for ACT Math prep and specific strategies for various students. I also worked for companies that provided ACT Math materials.
Algebra 1

Algebra 1

I am an 8th grade math teacher at public School with over ten years of experience teaching Algebra 1 in both school settings and academic tutoring programs. My deep understanding of the subject allows me to quickly identify and address common student misconceptions. I provide clear explanations, targeted practice, and personalized strategies to help students master algebraic concepts and build confidence in problem-solving.
Algebra 2

Algebra 2

I am a math teacher at a public School with over a decade of experience teaching and tutoring Algebra 2 in schools and academic programs. I have a strong grasp of the curriculum and can pinpoint and address common areas where students struggle, such as functions, quadratic equations, and advanced algebraic concepts. My lessons are designed to strengthen understanding, improve problem-solving skills, and prepare students for higher-level math courses.
AMC (Competition math)

AMC (Competition math)

I am a math coach with over a decade of experience teaching competitive math, specializing in AMC 8, AMC 10, AMC 12, and AIME test prep. I currently coach students at Art of Problem Solving (AOPS) for AMC 10 & 12. Many of my students have qualified for AIME and achieved excellent results in AMC competitions and other math contests. I focus on building deep problem-solving skills, strategic thinking, and contest readiness for students aiming to excel in math competitions.
Calculus

Calculus

I specialize in helping students master AP Calculus AB and BC, as well as College Calculus, including Multivariable Calculus. I personally scored a 5 on the AP Calculus BC exam, and most of my students achieve the same result. In fact, in the May 2025 AP Calculus AB/BC exams, all of my students earned a 5. Whether tackling derivatives, integrals, limits, or series, I break down complex ideas into clear, step-by-step explanations so students can understand and apply them with confidence. Additionally, I completed all levels of Calculus at UC Berkeley with straight A’s and have over a decade of experience teaching Calculus at both the high school and college levels.
Common Core

Common Core

With over a decade of experience teaching mathematics, I have guided students from Prealgebra to Calculus, fostering their understanding and appreciation of the subject. I currently work as an 8th grade math teacher at a middle school, where I have honed my ability to make complex concepts accessible to younger learners. Additionally, I have worked as a math tutor at an educational company, providing personalized instruction to help students succeed. I am also in the process of obtaining my single subject teaching credential, further solidifying my expertise and commitment to the field.
Elementary Math

Elementary Math

I am a certified middle school math teacher with extensive experience teaching middle school math and tutoring elementary students. My approach focuses on building a solid understanding of core concepts while fostering problem-solving skills and confidence. I create engaging lessons that help students develop a strong foundation and, most importantly, a love for math.
Geometry

Geometry

Middle school math teacher - 8th grade math Geometry specialist - 10 years + experience, knowledge in proving, def'n, theorem, properties, and other terms.
Precalculus

Precalculus

I am a math teacher at a public School with over a decade of experience teaching and tutoring Precalculus in both school and academic program settings. I have a strong command of topics such as functions, trigonometry, analytic geometry, and limits, and I know how to address the most common challenges students face. My approach focuses on building a deep conceptual understanding while developing problem-solving strategies that prepare students for calculus and higher-level mathematics.
Probability

Probability

I passed the P (actuarial test, received level 8). I took a Probability (stat class) in UC Berkeley and received an A. I have been teaching Probability class with college students and they successfully passed the class.
SAT Math

SAT Math

I’ve taught SAT Math for over ten years and scored a perfect 800 on the Digital SAT. I offer personalized strategies tailored to each student’s needs, whether you're aiming for a top score or building foundational skills. My lessons include unique prep materials I’ve developed, along with resources from top test prep companies I’ve worked with. Let’s work together to raise your score with focused, effective practice.
Linear Algebra
Prealgebra
Statistics
Trigonometry

Examples of Expertise

Thomas has provided examples of their subject expertise by answering 60 questions submitted by students on Wyzant’s Ask an Expert.

See all of Thomas ’s answers ›
Thomas K.'s Photo

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Response time: 17 minutes

Ratings and Reviews

Rating

5.0 (173 ratings)
5 star
(173)
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Reviews

Knowledgeable and patient calculus tutor

I cannot recommend Thomas enough for anyone seeking a tutor for AP Calculus. His tutoring sessions have been nothing short of transformative for my son. Thomas's patience is truly exceptional. He never rushes through concepts, ensuring that my son understands each step before moving on. This has not only built my son's confidence but has also made learning calculus less daunting. What sets Thomas apart is his straightforward talking style. He explains complex calculus problems in a way that is clear and concise, avoiding the jargon that can often confuse students. His explanations are direct, which has made it easier for my son to grasp challenging topics quickly. Thanks to Thomas's teaching, my son has not only improved his grades but also developed a genuine interest in mathematics. Thomas’s approach has been pivotal in preparing my son for the AP exam, and we feel confident in his abilities now more than ever.

Yang, 26 lessons with Thomas

Very Knowledgeable, patient, and effective

My daughter really likes the AP Calc BC tutoring sessions with Thomas. She said he's very knowledgeable about the material and knows how to gauge her understanding of the content to adjust his pace. He explains complex logic well and she feels confident about her progress and her ability to handle upcoming tests thanks to Thomas' help!

Jenny, 6 lessons with Thomas

Clear and Supportive Tutoring

Thomas has been tutoring my child for AMC 10 preparation, and we are very happy with his approach. He ensures essential concepts are well understood before moving on to past exam problems, which helps build confidence. His explanations are clear and easy to follow, keeping my child engaged. After each session, Thomas provides detailed notes summarizing what was covered, including areas to focus on next and strategies for improvement. Communication is always prompt and helpful, whether it’s answering questions or adjusting schedules. We truly appreciate his guidance and highly recommend him!

Jaehee, 11 lessons with Thomas

Very experienced teacher

Thomas is a highly experienced teacher. My child has taken about nine AMC lessons with him, and he explains concepts very clearly while demonstrating strong subject knowledge. He is patient, professional, and flexible with occasional schedule changes. I would strongly recommend Thomas to anyone seeking help with math!

Ashley, 13 lessons with Thomas

Patient, skillful teacher

My high school son has been working with Thomas to learn Geometry, and has found him highly effective at explaining concepts. My son has been enjoying their sessions, and has remarked that they are able to cover a lot of material quickly. Since Thomas is also a classroom teacher, he is thoughtful about what topics are important to learn in sequence, as well as what material is important for the SAT. Big thumbs up!

Caroline, 16 lessons with Thomas

Knowledgeable and patient tutor

Thomas has been tutoring my son for a little over a month. He is patient, explains concepts clearly, and provides structured guidance. While it’s still early, I can see he is helping my son build a stronger foundation in math, and I believe his support will lead to steady progress.

Li, 15 lessons with Thomas

Extremely Efficient & Effective Tutor

Thomas is an amazing tutor for competition math; he is currently helping my son with AMC10 and AIME preparation this year. He definitely knows his stuff - he is able to identify and close knowledge/problem type gaps effectively. He is very thorough and efficient in the way he breaks down complex problems. My son is very happy to have Thomas in his corner! As a parent, I am more than happy to have found Thomas on this platform. I love reading his lesson summary as he lets me know *exactly* what they had worked on during a class session. My communications with Thomas have always been great - He is prompt, kind and respectful. We appreciate his flexibility and accommodating us in occasional schedule changes, which helps ease things up as we juggle our busy schedules. Thank you Thomas!

Christy, 7 lessons with Thomas

best tutor

Thomas is an excellent tutor who has always accomdated my daugher in last minute test prep when she gets stuck. We appreciate his patience and ability to break down tough concepts in an easy to understand manner always making sure she understands before going to the next step!

Lisa , 4 lessons with Thomas

Patient and flexible tutor

Our daughter worked with Thomas through the summer to strengthen her understanding and progress ahead of current learning. Thomas was flexible with covering many topics, patient with explaining topics in different ways and until our daughter understood the concept. She says he is the best math teacher she has had. They covered algebra, geometry and some pre calculus.

Howard, 29 lessons with Thomas

knowledgeable and explicit

Thomas is very knowledgeable in elementary and secondary math teaching. He explained the problems explicitly to Lucas. And make sure he understands the content well.

Mei, 18 lessons with Thomas
Hourly Rate: $120
Response time: 17 minutes
Contact Thomas