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

5.0 (292 ratings)

1,462 hours tutoring

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About Thomas

Bio

I hold a Master's in Education and a BA 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.
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...

I hold a Master's in Education and a BA 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.
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: 12 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.

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Thomas K.'s Photo

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Ratings and Reviews

Rating

5.0 (292 ratings)
5 star
(290)
4 star
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3 star
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2 star
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1 star
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Reviews

Knowledgeable, patient, and incredibly effective tutor

Thomas K. has been an amazing AP Calculus AB tutor. He helped me with all the major topics in my course, including limits, derivatives, the Chain Rule, logarithmic and exponential functions, related rates, and applications of derivatives. Before working with him, many of these topics felt confusing and overwhelming to me, but Thomas explains everything in a clear way that makes even the hardest problems feel manageable. What I appreciate most about Thomas is his patience and how he makes sure I truly understand the concepts instead of just memorizing formulas. He always checks my work, explains mistakes in a calm and encouraging way, and shows me how to approach problems logically. His teaching style helped me build confidence in solving AP-style questions on my own. Thanks to Thomas, my understanding of calculus has improved a lot, and I feel much more prepared for my AP Calculus AB class tests and the AP exam. I’m now able to solve problems faster, avoid common mistakes, and actually enjoy learning calculus. I highly recommend Thomas K. to anyone looking for a supportive, knowledgeable, and highly effective math tutor.

Neil, 22 lessons with Thomas

Great tutor for ACT math!

Very knowledgeable of all necessary topics in math for the ACT. He possesses a deep understanding of the concepts, rather than simply surface level awareness, and uses it to help my daughter learn concepts. He doesn't just teach to help with a specific problem, but to ensure understanding of the concept itself. Would recommend!

Ying, 2 lessons with Thomas

Amazing tutor for AP Calculus BC!

Thomas is an exceptionally proficient tutor of AP Calculus BC tutor for my son. We have tried multiple mathematics tutors through Wyzant, and we have no doubt Thomas is the best tutor. His expertise spans a wide range of advanced mathematical topics, as evidenced by his teaching credentials at Art of Problem Solving (AOPS), one of the most rigorous mathematics programs that my son has attended for a few years. Thomas is highly effective at rapidly diagnosing areas where my son has knowledge gaps and providing targeted instruction to close those gaps. Thomas systematically breaks down complex concepts and provides expert instruction to ensure the student to master the concept comprehensively. My son consistently expresses how happy he is with Thomas's tutoring, and as a parent, I am extremely appreciative of Thomas for my son's top academic records in AP Calculus BC class.

Rachael, 30 lessons with Thomas

Great math tutor

Thomas has been working with my middle school children for a few months. He is a very knowledgeable and organized math tutor, and is especially good about challenging them with deeper thinking math problems. He uses the time very efficiently and also always updates me about what they worked on after each session, which is always appreciated!

Susan, 25 lessons with Thomas

Great teacher!

Thomas is an excellent teacher who is obviously qualified to teach college-level mathematics, yet he can explain mathematics concepts in a way that an average high school student can easily understand. My kid has been struggling in calculus, but Thomas is able to break down confusing concepts clearly and effectively, making the material much easier to grasp.

May, 2 lessons with Thomas

Supportive and helpful tutor

Thomas is clear and concise with his explanations and is patient when answering any follow-up questions. For competition math, he provides numerous solutions to different problems depending on what knowledge you already have. After every session, Thomas identifies any weak areas and lets you know what to focus on next. I strongly recommend him if you're looking to improve your competition math or general math skills!

Krystal, 10 lessons with Thomas

Knowledgeable tutor

Thomas was very helpful by giving my son many practice questions ahead of time so when they met, my son was able to ask him questions. Also he made my son comfortable by making some jokes when my son made silly mistakes

Thanh, 8 lessons with Thomas

Knowledgeable

Thomas has been tutoring my son in math for the SAT, and my son has been grasping concepts he definitely needed help with. He really likes the way Thomas explains and provides instruction. With the SAT date approaching, my son has worked with Thomas for a short period of time, but Thomas has been very accommodating and has provided as much help as possible.

Brenda, 3 lessons with Thomas

Supportive & Engaging Math Tutor

Thomas is a great tutor for students who want to be challenged and supported in their mathematical journey. There is a clear focus on fostering a deep understanding of concepts. He is truly committed to the student's success. What stands out most is how he encourages critical thinking and problem-solving. Students are pushed out of their comfort zones in a supportive way, helping them develop skills that will benefit them far beyond the classroom. My child enjoys his classes and feels quite engaged through out the session. Highly recommend his tutoring!

Meena, 27 lessons with Thomas

Good math contest knowledge and patient

Thomas is very knowledgeable and patient tutor. He explained and provided the detail proposal on how to rebuild the math foundation for the student to have long term strategy to achieve higher core on AMC competition. He walked through the math concept and gave hint instead of directly show the solution during class to let student to think independently and learn from their mistakes.

Xiaojun, 21 lessons with Thomas