For any math class you need to have all of the previously learned definitions, theorems and formulas in your long-term memory in order to advance in math. There is a memory strategy called spaced repetition that can monitor the forgetting curve of previously learned material. When you are dealing with math it is important to review as far back as the previous math class.
Wikipedia: forgetting curve, Active recall, Anki, Spaced repetition google "Algebra Acrostic Dictionary" and "Geometry Acrostic Dictionary" Acrostic mnemonics provides a better encoding and retrieval process for memory.
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