I applied for the course but didn't use it, so I'm selling it as new and unused. Instant purchase is OK. Price negotiation is not accepted. [Contents] ・Textbooks: 4 books ・Grading problems: 1 book (❗️The grading system cannot be used, so please grade yourself.) ・7 sets of past exams (October and December of Reiwa 1st and 2nd years, October and December of 3rd year, and 4th and 5th years), with answer keys and explanations for each