This is a famous book. I consistently scored 80% on the Common Test mock exams using only this reference book. It's a set for Chemistry Basics and Biology Basics. Everything is written in. The writing is in orange ballpoint pen, so it can be hidden with a red sheet. The handwriting is messy, and there are some mistakes (see photo 3). No returns accepted. Please purchase only if you understand. - Title: KOKO BASIC CHEMISTRY - Title: KOKO BASIC BIOLOGY - Publisher: KOKOMIRAI.TEXTBOOKS #CommonTest #KOKOMIRAIChannel #KOKOMIRAIChannel