since i'm Chinese, i'm really not good at verbal, the first time i took GMAT, i got just 26 on Verbal, i really practiced hard on Verbal before my second try. i've done much work on sc and that's why i could improved a lot in my second try. as for the Math part, do some exercise is necessary to keep a high accuracy rate.
material used:OG 12
i tried to make sure that i was familiar with any keypoint of the quantitative section. by doing the exercise, i knew which part i was not good at, so i went back to the OG to review that part. then i took some tests on Manhattan, again, i improved myself by correcting the questions that i did wrong during the tests.