Need help in AP Chemistry

In AP Chemistry, 70% of our grade consists of tests and quizzes and I’m horrible at those… My grade is a C right now and I really need help to raise my grade. I would be OK with a B this marking period and then hopefully get an A next marking period. I also heard that he midterm is easier that the test we usually take in class. How could I study better so I can get the grade I want?

My teacher swears by the Princeton Review AP Chem book

Khan Academy helped me nail some of the basics, and I also like looking online for notes in case I don’t understand the textbook.