This is the Kawaijuku 2025 Second Common Test Mock Exam, including answer keys and explanations for mathematics and science. Pencil markings have been erased with an eraser. There are some pen markings on the answer keys, explanations, and the mathematics 1A question paper. Also, there are many pencil markings on mathematics 1A and basic chemistry, and the eraser marks are noticeable, but neither should cause any problems when solving the questions.