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What should I do if I buy the wrong one in Grade Two?
In the second grade, you can buy "Math Error-prone Questions".

As a parent, what I like most are some columns in this book, such as the breakthrough of easy mistakes and confusion, the intensive explanation of difficult exercises, and the detailed explanation of common mistakes and difficult problems in children's learning. It's very suitable for my children who can't master it in class. If necessary, you can buy a copy for your child. Pro-test is effective.