Primary school teaching AIDS are mainly used by parents. Children are unlikely to teach themselves because of their reading ability.

The lower grades are mainly about the cultivation of study habits. So when you choose a supplementary book, you should see if it can help you in this respect. Personal advice:

The textbook is fully interpreted, the solution is complete, the king of general practitioners, the Homebook in class, and the test paper is complete. The above suggestions are enough to buy, talk and practice. You can buy an oral question card by the way.