Buy an NCLEX study guide
and start doing questions in it well before you begin your actual classes. That is the only thing that will prepare you for the difference from Pre-reqs to nursing classes in ANY nursing program, whether ADN or BSN. The biggest difference in nursing school and pre-reqs are the tests.
Pre-reqs you use memorization of facts, this is that and that is this, right and wrong answers are clear.... whereas in nursing school you need to know that this does that because of this, this, and this, and it causes something or needs something. You need to know that there aren't usually clear right and wrong answers, but there is 1 answer that is more right or more wrong than the other answers.
Application, Analysis and Critical Thinking are valuable tools to your success, starting to master those now, will prepare you for nursing school and it won't be too hard anymore.