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Well, of course, knowing when and how to apply formulas is key.
OP asked for "formulas that r helpful for the sat other than the ones that are provided already in the math section" - the formula for average rate happens to be one that I used on the March SAT.
Did it take "common sense" to know when/how to apply it? Yes.
Did it help to know the formula & its usage beforehand, given that the SAT is a timed test? Again, yes.
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