The best tip will always be to work steadily on your chosen subject throughout the term/semester. You need to prioritize working on the topics you find the most challenging rather than the topics you already have a good grip on.
If you pay attention in class, concentrate on each topic, do relevant exercises and read the curriculum, you will be well prepared for the exam. After all, the exam is designed to test whether you have learned the stuff you were supposed to learn at the end of the term/semester.