Yes, immediate purchase is fine. Hamagakuen (Hamagakuin) Science Understanding Problems 1 & 2 Science Understanding Summary of Key Points 1 & 2 Final Approach 1 & 2 A set of 6 books. Answers and explanations are included on separate sheets. Answer sheets are also included, with numbers 1-40. There is some writing on the answer sheets. Please note: I believe there is almost no writing in the textbooks, but there are some folds and stains. The answer sheets have had the name section cut out, have been stamped, and have folds. Please check the photos. Please consider purchasing if you understand the above. Even if you are in the middle of exchanging comments, the person who purchases the item first will have priority. Thank you for your understanding.