One: If you have money, you can go to the bookstore to find some teaching AIDS that can help you study. There are two situations at this time: 1. There is a heavy burden and a lot of homework in college. At this time, you can buy some teaching AIDS that have not been practiced; If you think doing more exercises can consolidate your knowledge, you can also buy some teaching AIDS with exercises.

Second, if you are not rich, of course you won't buy it!