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구자익
Reviews
197
Graduated from Korea University (Seoul Campus) Served as the Director of a renowned academy in the Gangnam 3-gu district for over 15 years Personally produced over a dozen textbooks for elementary, middle, and high school students Taught a student who achieved a perfect score on the 2016 CSAT starting from their first year of high school. For 15 years, I taught middle school classes for medical school and top-tier students, as well as high school classes for Grade 1 students and Grade 1 CSAT students in the Gangnam 3-gu district of Seoul. As an academy director for 10 years, I gained diverse experience teaching students of various levels. In particular, the teacher has the strength of reading students' thoughts, quickly identifying their habits, and presenting appropriate countermeasures and methods. Through the teacher's diverse teaching experience and student observations, countless students have gained confidence in mathematics and improved their grades. Mathematics is a discipline that organizes complex thoughts and aids in problem-solving. In other words, it is a subject that is truly essential to us. However, nowadays, students view mathematics as a subject where they must memorize concepts and theories (without critical analysis) and repeatedly solve problems by type (without knowing why they are solved that way). Mathematics is based on operations, and as students advance through the grades, they must learn by connecting and expanding upon new concepts and theories with what they have already learned. However, students who strongly believe that mathematics is solely about operations face limitations because they view the subject through this single lens. Consequently, the better a student's calculation skills are, the more difficult middle school mathematics feels. This difficulty is experienced again when learning high school mathematics. Mathematical concepts and theories require students to develop a habit of proactively understanding them, while problem-solving requires problem analysis and solution strategies. Only by learning "the connection and expansion of mathematical concepts" and "problem analysis, understanding, and problem-solving strategies" will students realize that mathematics is simple and easy as time goes by. The teacher will help students come to this realization. The teacher's teaching method is somewhat unique. 1. The teacher explains "why" concepts and theories are necessary, "how" they are expressed in a particular way, and "what" they connect to among previously learned concepts. 2. The teacher provides students with the opportunity to express their own thoughts. This allows the teacher to distinguish between well-thought-out ideas and those that need correction. 3. Understand the student's thought process regarding 'how' they solved the problem. 4. Teach how to analyze and understand problems, and the starting point for solving them. 5. Do not teach by categorizing problems into types. Therefore, do not teach solution methods by categorizing them either. 6. Regularly check whether the student solved the problem correctly (logically), and encourage them to express their thoughts verbally (verbal expression helps them identify their 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)
197 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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