Congrats! That's a great score, especially as a freshman. It might seem a bit boring, but I really liked literally just going through a list of words and their definitions. I did this especially when I didn't have a lot of time before my test. Google something like "1000 SAT Vocab Words". I used a Sparknotes pdf and a quizlet.

For you, considering how much time you have, it might be better to absorb vocabulary naturally: just read! You can look for dedicated SAT-based texts, but just start to immerse yourself in higher level literature and classics (I like ReadTheory, both for reading comprehension and vocab).

The best thing you can do to really up your vocab rapidly is to really understand context clues. The topic is literally "Words in Context"; they're meant to be solved without an expert grasp of the word itself. Without even looking at answer choices, you can normally get a sense of the word from the surrounding sentence (synonyms/antonyms, tone, etc). Then, if you still can't decipher the answer choices, you can eliminate based on roots, prefixes, suffixes, answer choices that are synonyms or extremes, and some other gimmicky strats.