APWH Exam

Hey, so I am a high school sophomore taking AP World History, and the AP Exam is May 14. I was just wondering how I should study for it and any advice going into the test. I bought the 5 Steps to a 5 book and I’m going to use that to study. Also, I have heard that colleges are mostly only taking 4’s and 5’s on the exam. Is this true? Or do some accept 3’s?