“Problem Basic Book Sen” contains all the problems that appear on school exams.

All the math problems in the elementary school curriculum are summarized.
You can completely complete elementary school math learning with just one volume of "Strong Math," which contains all the math problems from the elementary school curriculum, including textbooks, workbooks, and even problems from school exams.

All problems are organized by difficulty level.
A reasonable way to learn math is to tackle problems in order, from easy to difficult.
〈Strong Math〉 is organized by level, dividing the difficulty of the problems into three levels: A, B, and C. Level B is further divided into high, medium, and low levels, allowing you to systematically improve your math skills.

All problems were analyzed in three dimensions and categorized.
Based on analysis of textbook concepts, practice books, and school exam questions, all problems that must be covered in elementary mathematics at each grade level are classified and organized by type, so that problem-solving skills can be developed through sufficient practice of problems by type.

Efficient self-directed learning and repetitive learning are possible.
We provided a “Learning Implementation Plan” organized into a table for each unit so that students can proactively plan and repeatedly learn about their weak points.