Seoul National University, Yonsei University, Korea University, POSTECH
The author's book, "Repair and Argumentation," which easily broke through all these huge doors.
A witness to passing the math essay exam, providing test takers with the most realistic weapon for passing the exam.

- Seoul National University, Department of Mechanical Engineering (Major)
- Seoul National University Department of Mechanical Engineering, first general admission
- First essay-based admission process for the Department of Electrical and Electronic Engineering at Yonsei University
- First admission to the Department of Mechanical Engineering at Yonsei University through the excellent activity selection process
- POSTECH's first joint venture with the Department of Eunjae
- Korea University Department of Electrical and Electronic Engineering, Department of Appropriate Admission
- Graduated from Sejong Science High School
- Secondary KMO 1st gold medal, 2nd bronze medal

The college entrance exam study method doesn't work.
The mathematical reasoning test is a test that requires logical thinking and proof, and cannot be solved by simple calculations or memorizing formulas.
Many students, accustomed to the CSAT-style solutions, experience a point of stumbling when it comes to the essay test.
This book is a new starting point that breaks through that blockage, and is an all-in-one preparation guide for all students preparing for the mathematical argumentation exam.

〈28-Day Operation Mathematical Reasoning〉 is structured around mathematical reasoning/in-depth concept explanations.
Rather than simply listing textbook definitions, we've broken down concepts into a format that fits the essay question and carefully presented the necessary proofs to help you learn a logical development method.
This allows for “writing and thinking” training on a different level from the CSAT.

Above all, this book is composed mainly of questions created by the author himself.
Rather than simply listing and explaining past exam questions, the book includes step-by-step questions designed by the author, from basic questions to more difficult, advanced questions.
Therefore, students can naturally begin with basic descriptive training and gradually progress to more difficult, in-depth questions, systematically acquiring the critical thinking skills and logical development methods required in actual exams.
Additionally, each problem includes detailed solutions written by the author, allowing even independent students to follow the flow of answering questions.

As you solve problems, you will sometimes encounter concepts that are not included in the current curriculum.
For example, topics such as trigonometric substitution integrals, monotone convergence theorem, and space vectors are outside the curriculum, but can be presented as a presentation and are actually very helpful in the solution process.
In this book, all parts not included in the curriculum are included in the presentation, so you can refer to them. In particular, problems that require trigonometric substitution or the concept of space vectors are marked separately.
Therefore, students who have set up the equation up to the point of calculation and decide that no further work is necessary can proceed to that stage and then skip.

The author also attended numerous academies while preparing for the entrance exam, and there was not a single academy that did not teach these theories.
This is not simply a matter of curriculum, but rather an important tool for broadening one's thinking and developing intuition in mathematical reasoning.
Just as we intuitively judge convergence using the monotone convergence theorem at the starting point of a solution method, knowing this theorem can change the speed and depth of problem solving.

Looking back on the author's experience, the mathematics outside the curriculum, such as number theory and algebra, that he encountered during the KMO preparation process in middle school later became a solid foundation for mathematical reasoning and in-depth study.
I want to emphasize that just because something isn't included in the curriculum doesn't mean you "don't need to know it." Rather, knowing it can be an asset that enables more diverse thinking and enhances problem-solving skills.

"28-Day Operation Mathematical Argumentation" serves as a foundational stepping stone for beginners, a springboard for more challenging students to advance to more in-depth problems, and a complete textbook for some students.
We hope you take your first steps on the path to preparing for the math essay test with this book.