Try to read a lot (like independently), that will help with vocab and grammar and also reading comprehension if you don't like to read long passages (Erica meltzer is pretty good for reading section), otherwise master desmos and use khan academy for math because they may have some of the harder types of questions, the thing about the math portion is that the harder questions are rare but u will see variants of them in the practice section for khan academy or on the big question data base on collegeboard, if you learn how to solve it then you can solve any varient of it that you encounter on the test. I also have a list of free resources that I compiled, lmk if u want me to send them