A 200+ increase is possible. Whether it's possible for you completely depends on how effectively you can study.
My short advice:
If the vocabulary isn't sticking, then try studying fewer words at a time. Start it off easy with 10 words a day. Try to commit them to memory every night, or even better, take 10 flashcards to work with you, put them on your desk, and whenever you get the chance, study them.
With math, that's all about practice. Again, start off easy. Do a practice math section per night. Don't stop there though. Correct it, know EXACTLY why you got certain questions wrong. Was it a careless mistake? Be more careful tomorrow. Did you not know how to solve the problem at all? Find out how.
As days go on, stay consistent. You'll find that you become more efficient and studying becomes a bit easier. When it gets easy, up your efforts. Study more words per day. Do more math sections at night.
Good luck.