Thank you for viewing. Please read the profile. This is a problem set for Mathematics I:A, allowing for 50 exercises in 30 minutes. Includes answer explanations. - Title: Mathematics I:A 30-Minute Exercise Session, First Edition [50 Questions/30 Minutes] - Format: Problem set - Contents: Mathematics exercises - Language: Japanese - Target audience: High school students This item has been stored at home. Please refrain from purchasing if you are concerned about the condition or are overly sensitive. I haven't noticed any significant damage, but there may be oversights. Please understand. Thank you.