It's best to solve it yourself, because only you know your weaknesses best and specialize in weak links. Be familiar with the textbook first, and master the basic things before practicing the questions. I believe you should have no problem. But one thing needs to be noted, that is, we must make a good plan, how much content we have to carry out every day, we must follow the plan, and we must not drag our feet!

I hope I can help you.