1. Buy a grammar book first, read the explanations and examples first (don't underestimate the examples, most of them are typical sentences).

Do exercises, don't be tired, you don't know how much you have mastered without doing them.

Be sure to find out why the wrong question is wrong. Because you will find new grammar points in the wrong questions, and then prepare a notebook to write them down. Also, you will sum up some rules and skills for doing problems.

Reading questions are based on a certain amount of words. I suggest you recite the words you didn't understand in the previous paper, which is basic. Then you can do some expansion and accumulate TOEFL words (no harm)

Listen more, and you can also do some questions appropriately. There should be no problem with listening, right?