Please be sure to read the profile before commenting. It states that price reductions are not possible, etc. 2025 Implementation SAPIX SO Test Problems, Explanations, and Answers Answer sheets are not included. Original. Used and stored at home. Please understand that this is used and stored at home by a child. There are pencil markings on the problem sheets. There are no pen markings. There are pencil checks on the answer explanations for incorrect answers. Please understand and purchase with the understanding that there may be oversights.