I had to figure out how to study for SAT in one month because I procrastinated way too hard, and honestly it ended up being way more doable than I expected. I stopped trying to "study everything" and just did 3 things: one timed module, review every mistake, and 20-30 targeted practice questions at night.
The biggest score jump came from reviewing wrong answers super carefully. I kept a notes doc with the question type, why I fell for it, and what clue I missed. For reading, I practiced slowing down on evidence questions. For math, I made myself redo missed problems without looking at the explanation first.
Also, taking a full test every day burned me out. Two full tests a week was enough. If you're trying to improve fast, I'd honestly focus more on patterns in your mistakes than on doing a huge amount of random practice.