In the afternoon, you can spare some time to do math problems every afternoon or do math for an hour and a half in the evening, buy a summarized reference book, practice all the problems, put them down if you can, and do more if you can't. Starting with multiple-choice questions, try to improve the quasi-curvature of multiple-choice questions to 100%. For big questions, you must ensure that the first three questions are correct and the last one is as correct as possible. Do what you can, and don't do what you can't.