I also found this product very helpful for studying. By using it during spare moments like travel time or breaks, you can study without feeling burdened and actually enjoy it. Although Biology Master ①, ⑦, Science Master ①, and Earth Science Master ① are missing, this is a highly recommended product. I'm selling the complete set for 30,000 yen, which is a discount from the regular price of 50,937 yen. If you start using it in the 4th grade, studying will become much easier. If you're interested, please consider purchasing it.