Teaching AIDS should be refined, not too much: extracurricular teaching AIDS are only a supplement to textbooks. You can choose 65,438+0-2 books for each subject. The basic configuration is knowledge point explanation 1 book, exercise 1 book, weak subject 1 book.
Try not to buy the same type of teaching AIDS repeatedly, and don't think it will be useful to review later. It is very likely that you just turned a few pages at first and put them in the corner to eat ash.