Actually, you don't have to. The knowledge of the first grade teaching edition is actually quite simple. For example, you are learning algebra and rational numbers now. You can buy your own information, and online will make you too dependent.

I think you should study the absolute value well, because it has been widely used in your junior high school for three years, such as simplifying something.

Algebraic expressions should also be easy to learn, such as monomials and polynomials. Be sure to understand their concept, if not, please ask. Because the first grade is only one year, it is impossible to tell you this knowledge for the second time. If you want to cultivate your ability, you can buy your set of exercises to do.

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