Self-testing is crucial if you want to improve your academic performance.
Don’t just read your book and study material. Study smart and test your preparation. After reading 2-3 topics get yourself a quiz or practice as many exercises as you can related to that topic. This will help you know how much you have learned and what topics you have to focus on. Test yourself frequently by quizzing yourself on the key concepts and equation. Keep reviewing the questions that you get wrong until you learn them and get them right. Practice questions from different sources. Re-do questions that you got wrong and try to figure out your mistake.
Work Hard & Study Smart!