Price reduced! This is a set of 7 subjects from Kato Seminar's Basic Problem Practice Course, known for its high-quality content. It has not been cut. I purchased it in 2023, but I'm selling it because I no longer need it. The covers show some signs of use, but there is no writing inside. The content is from 2023, so it's not that old and should still be perfectly usable. I think it's perfect for output practice after you've input the knowledge. Personally, I found it easier to understand than Agarooth's Important Questions! Please feel free to negotiate the price.