Complete guide for the AWS Certified Developer - Associate exam. - Title: Pocket Study AWS Certified Developer Associate DVA - Author: Mitsuhiro Yamashita - Publisher: Shuwa System - Price: 2100 yen + tax As shown in the third photo, there is some discoloration, but the contents are clean. It's a thick book, but more than half of it consists of diagrams and screenshots, so I don't think it takes that long to read it all. I like it because there are many diagrams and the explanations are easy to understand. Each chapter has end-of-chapter questions, and there is a practice exam at the end. If you can solve all of these, you can pass. Of course, I passed with this book.