Always go to the tutors/GA’s. They will guide you on how to study for the class and the tests and will “prepare” you with additional information. That’s what all of my dd’s A peer students did.
There’s so much to say on the subject, a person could write a whole book on the subject. Luckily, they have! Check out Cal Newport’s “How to Become a Straight A Student” to learn how to study and “The Secrets of College Success” by Lynn Jacobs to learn how to do it in college.