And another thing to add is that it’s more so quality, not quantity, when it comes to SAT/ACT prep. You can bang your head against a wall by just taking practice tests and getting the same types of questions wrong, wasting time and getting yourself more stressed. Instead, you should find out what specific problems are tripping you up—arc length, probability, series and sums, etc.—and relentlessly go after the gaps in your knowledge.
When all of that is said and done, then yes, there are strategies for taking the different sections of the SAT/ACT that save you time and get you a higher score. But you can only really take advantage of those if you don’t have content gaps.