one month of studying down.. one month to go!!!

I also faced same problem but I was able to increase my SC score upto 80%. Focus on these two points:-
1) read and remember each explanation given in OG for SC

2) once you read a SC question stem, see in answer choices what is varying. I mean generally SC breaks its choices between 2 type of Idioms out of which one is correct. Then from all choices with correct Idioms, see subject -verb relationship. Once Idioms and subject-verb relation are OK then, check for typical GMAT liking-disliking (i.e. Active voice is preferred, smaller sentence is prefer ed, that/which, etc). This approach, if you could develop along with doing SC with OG can help you a lot. I bet you would need hardly a week this way to improve your accuracy.

I can give you some examples with this approach if you want.
In last remember few SC questions (say 1-2 in 14) are tricky and no approach works on them. There experience and luck works.