Not to discourage you, but having a “tutor soon” won’t guarantee your SAT1 to increase 200 points. If I were you, I would focus on getting SAT1 up and forget about subject tests and working on a list of schools that don’t require subject tests. You might not have time to do them both.
But if you think you must, try take Math II and a non-stem subject tests?
Tbh, you might get more bang for your buck by focusing on college essays and looking at test-optional colleges.
Good luck.