I'm getting 0% on SC, how to improve a bit?

Just a disclaimer, I'm getting 90~%+ on quant, IR and RC, getting 700+ level usually, did some practice tests (mba.com, and manhattan) , and my scores are in the 690-720 range. (My target score is 700-720)

I got all that with a 0-10% correct SC answers, which should be fine, but I believe improving a 0% to 50% is not that hard (should be the same as going from 80% to 90%), I just don't know how.

Any advice, even ones that help with better guessing? My exam is on september 16, so I don't want to and can't spend too much time on learning exact grammar rules and such, just some smart, or easier strategies that could help with easier SC questions is appreciated.