[Textbook Introduction]
1.
This is a 'perfect self-study book' that allows you to learn course concepts and prepare for internal exams on your own.
2.
This textbook helps you solve problems with friendly explanations.

[Special Features]
① Textbooks that allow for self-study
-Friendly explanations are a given! The systematically organized content is supplemented with detailed explanations and annotations, as if you were listening to a lecture.
-[I'm curious!] will resolve your curiosity, and [Memorize!] will tell you the parts you absolutely must memorize.
You can build solid skills through Teacher Wanja's special lecture.
② The problem structure is also perfect
- It consists of questions of a similar type to school exam questions.
-Step-by-step problems for each unit: Basic problems → Core problems → Skill improvement
-Effective conclusion for each chapter: Key summary → Key material → Conclusion questions
③ Another book, 'Correct Answer Friend'
Detailed explanations for every problem are a given! With explanations that pinpoint your most pressing issues, you'll be able to fully understand even the most difficult questions.
Pictures are easier than words! Important information is explained in detail with pictures.

④ 'Mini Wanja', a must-have on the morning of the test
-It's perfect for organizing concepts right before the exam.