This is a problem set from Eiko Seminar's theme-based elective course. It's also recommended for a quick review the day before an exam. It's thin, so it's motivating. For overcoming weaknesses. Some questions have circles marked, and there are some notes written in the problems. For those who understand, m(_ _)m - Title: Thorough Practice! Ratios and Speed - Contents: Includes problem sets and explanations - Format: Booklet - Target Audience: For math study - Sections: With problems and answers. Entrance exams for junior high school Arithmetic Textbook Waseda Academy SAPIX Nishikin Eiko Rinkai Seminar Toshin