I spent about 15 on used prep books. I feel like d20 could have gotten a 1600 but after taking the test once, she did not want to take it again. With just khan, books and about 4 hours total of review she got close to 1500. She was just overwhelmed and exhausted by the process and got the attitude that if a college didn’t want her “as is” then it wasn’t the right place for her.