I am a non-native speaker. I took the real GMAT couple of weeks earlier and received 37 in verbal. I think the score is kind of underestimated. Because of the urge to go to restroom, I could not focus on the second half of verbal. Anyway I think I am at 38/39 range. I need to get to 41/42 range to get the score that I wanted. My weakest part is SC. I already exhausted OG 10, 11, 12 and 13. What would you suggest me to do to get to 41/42+ range? If needed, I can invest 3 months just for SC. I really need to imporve my SC.

Should I redo OGs, read literature, read more grammer books, read forums post by instructors? I am confused on how to get myself into the next level on SC.

Thank you very much!