You can practice as many previous year’s questions. Analyze each of the previous year's questions and understand the question pattern. Upon attempting the previous year's question, you can find topics you are weak in. Work on improving your weak areas as well while you go through the notes every day to help you memorize them well. Make a plan in advance for your revision and stick to it. Once you complete reading one chapter, make summaries, recall everything you studied and summarize the chapter.