Hi! I definitely recommend using Khan Academy SAT questions, since the program is personalized to your progress, practice scores, and all that!
Books: I recommend Erica Meltzer and College Panda, they are both wonderful publishers and leave much room for both content and practice.
You can go on CrackSAT, the website, it has a lot of practice problems on there.
I would recommend making a calendar or schedule to make sure you are covering the right and wrong questions or sections. Make good use of your past tests as well, you can really track where you need to improve and maybe where you can spend less time and focus on other topics.
Don’t burn yourself out, at least spend 45 minutes everyday just studying on your SAT, rather than overdoing or underdoing it. Sleep and eat well before the test, you got this!