Please check the profile. This is not for solving problems, but for use as a reference book to understand "how to solve this problem." There are handwritten notes in pencil and red/blue pen from lectures. The cover is also dirty because it was crammed into a school bag. This is for those who are okay with being able to see the inside. Many important terms are included. Audio may not be playable. A set of reference books for difficult English for 2nd-year high school students in 2024 and English grammar and usage for 3rd-year high school students in 2025. - Title: Difficult English 2024 for 2nd Year High School Students - Title: English Grammar and Usage 2025 for New 3rd Year High School Students - Contents: Includes content and reviews divided into each chapter #High School Green Course