
구자익
Reviews
199
About the Teacher
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A Math Mentor Who Awakens True Math Skills "Mathematics is not about rote memorization, but about expanding one's thinking." A math academy director with 20 years of experience in the Gangnam 3-gu district, having produced countless top-tier students, will help you break free from superficial problem-solving and cultivate the true power of mathematics. 🌟 20 Years of Veteran Guiding Entrance Exams and Top-Tier Students in Gangnam 3-gu Graduated from Korea University (Seoul Campus) Served as Director of a Famous Academy in Gangnam 3-gu (Total 20 Years of Experience) Personally authored over a dozen proprietary textbooks for elementary, middle, and high school academies Personally guided a student who achieved a perfect score on the 2016 CSAT, starting from their first year of high school He has led middle school medical school preparatory classes, top-tier classes, and high school classes for Grade 1 and CSAT Grade 1 in Seoul's Gangnam 3-gu district. As a director for 15 years, he has achieved significant academic turnarounds for countless students. He does not merely observe a student's outward appearance; instead, he quickly reads their attitude toward problems and their thought processes to provide customized solutions. With solid teaching expertise and keen observation of students, even children who were on the verge of giving up on math are regaining their confidence that "they can do it" and experiencing the miracle of improved grades. 💡 Why is math getting harder for my child? If math feels difficult and burdensome as they advance to higher grades, it is not the child's fault, but rather because they are viewing math incorrectly. Many students misunderstand math as a subject where they "mechanically solve problems by blindly memorizing formulas and problem types." However, if you rely solely on calculation skills and miss the essence of concepts, you will hit a wall in middle school math and completely collapse in high school math. Mathematics is a discipline that requires "the connection and expansion of concepts" beyond mere calculation, as well as "analysis and solution strategies" to see through problems. I will help your child realize for themselves that math becomes clearer and more lucid as time goes by. ✍️ I assert that my teaching method is somewhat special. It begins with the question "Why": I pinpoint the essence of why concepts and theories were created and how they organically connect with previously learned concepts. I encourage students to express their thoughts verbally: Through the process of students verbalizing and reviewing their own thoughts, I help them realize for themselves what is correct and where they need to make corrections. We read through the solution process together: Rather than a class focused solely on getting the correct answer, I meticulously analyze the thought process of "how" the child viewed and approached the problem. I provide clues for problem-solving: Instead of blindly giving hints, I teach how to analyze and understand the problem to take the first step toward a solution. I do not conduct rote memorization-based classes: Because I do not inject rigid, formulaic solution methods, students develop the ability to logically solve even unfamiliar, high-difficulty questions on their own. I cultivate logical descriptive skills: Through training in expressing one's thoughts and solutions in logical language, I guide students to accurately identify and address their own weaknesses.
Experience & Activities
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Teaching middle and high school subjects to middle and high school students for approximately 20 years
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Coaching for various competitions such as KJMO, KMO, and AMC
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Producing numerous successful applicants to electronics high schools and specialized high schools
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Producing numerous students with Grade 1 high school GPA and CSAT scores in the Gangnam 3 districts for over a decade
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Produced perfect scorers on the CSAT (2016 academic year)
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Selling books personally created by the teacher at Kyobo Book Centre (search for JIK)
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International school IB classes or AP courses (Pre-Algebra, Algebra, Geometry, Combination, Number Theory, Pre-Calculus, Calculus)
199 Parent Reviews

김**
11years old
2025. 11. 20 PM 9:11:2
중등선행: 빠른 진도를 원하는 학생을 위한 중등 대수학 (1-1, 2-1, 3-1)
My 3rd-grade child, who is currently taking the Elementary Hwangso course, is preparing for next year's Middle School Hwangso by continuing with Mr. Gu Ja-ik. Although the class is only one hour long, he conducts it strictly according to the standard method, appropriately balancing theory (principles) and practice (problem-solving) so that the children can learn efficiently. It must be difficult for my child since he hasn't even done any advanced arithmetic, but I can hear laughter during class. I told him that he could learn it a little later if it was too overwhelming, but he replied, "What are you talking about? It's fun!" I am posting a screenshot of yesterday's class notes. If time permits, I would love to take the geometry class as well. Thank you, teacher, and we look forward to continuing with you.
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It helped 2 people.

서**
15years old
2025. 5. 31 AM 11:46:7
완전정복!! 중등수학 '방정식 활용' 문제풀이의 원리 : 중등 전 과정을 대상으로
At first, he checked how much the students already knew and verified if there were any specific parts they found difficult. He then reviewed those parts one by one! Having them solve problems themselves also helped strengthen their calculation skills. He calmly and slowly explained the equation application problems, one by one, continuously checking for any difficult questions and verifying once again whether they were fully understood. He also provided links to worksheets and had us work through them together. Originally, the session was supposed to be about solving equation application problems, but since I mentioned something I didn't understand well, he finished that part first and then explained the content of the lecture.
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구자익
2025. 5. 31 PM 4:9:16
Since the student was so focused in class, teaching was enjoyable for me as well. It is my habit to tailor my explanations to the students' level, so I check how well they understand before starting the lesson. Still, it is impressive that the student clearly identifies what they know and what they don't.
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It helped 1 people.

최**
13years old
2026. 3. 29 AM 10:22:7
중등선행: [퀀텀점프] 중1 과정 : 사고력+추론력을 키우는 강력한 수업!! : 수학자처럼 생각하기 (개념과 증명 중심)
It was the first class, and it covered some challenging topics for my child... but they said it was fun because the teacher explained everything so well! My child is used to simply learning concepts, solving problems, and getting the correct answers, so I signed them up while looking for a class where they could think deeply about math and learn the process of proof. I was very satisfied because the class is conducted in small groups and the teacher constantly asks my child what they are thinking. I plan to continue taking the class regularly.
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