I've only read through it once. I'm selling it because I no longer need it. Please note that it is being sold as a set. Reference books that systematically teach English and mathematics for high school and junior high school. - Book Title: A Book That Thoroughly Explains High School English Grammar in One Book - Book Title: A Book That Thoroughly Explains 3 Years of Junior High School Mathematics in One Book - Target Grade Level: High School & Junior High School Thank you for looking.