First of all, believe in yourself. If you study, you will do well.
Here are a few tips I give my students.
1. Make an outline or study guide of your reading or lecture materials.
2. Read the outline at least 7 times. A research study showed that students who prepared an outline and read them at least 7 times obtained much higher scores than peers who read their notes less than 7 times.
3. Make flashcards as my colleague suggested. As you use them, take the ones you answer correctly and put them at the end of the stack. Those you get wrong put in the middle of the stack. That way you are studying what you don't know more frequently.
4. Ask your teacher what he or she recommends. Perhaps it will help.
Best of luck!