You can research test prep for the SAT2s, however, they are best taken fresh after the relevant courses. Bringing up a 500 score is not easy and you don’t have much time, given the retest you are preparing for the SAT1. How about a foreign language SAT2.? Try a practice test in a language.
What courses have you taken each year , and what are your grades?
Are you going to need financial aid? What are your parents willing and able to pay for college?
Have you researched and selected some good target and safety schools? You should have at least one college that you know Will accept you. Really, a couple of them would be great and a few match schools too
Once you have those in place, you can apply to the lottery ticket schools with impunity .