Kigaku Academy Grade 5 Highest Level Exercises Science Volume 1 to Volume 4 One year's worth I received these from another site. I used them to check my weak points. There are some writings, such as in the calculation sections, but I think they were used carefully and are relatively clean. However, since they are used, please purchase them if you understand. Volumes 1, 2, and 3 have indexes attached to each No. I found it convenient, but please refrain from purchasing if you are concerned. The name section has been cut out.