I make a progress in SC. I've just found a site www.gmatonlinetest.com and solving one SC quiz that contains 15 SC from it I did 14 out of 15 questions correctly. Seeing SC question I notice typical mistakes in wrong variants at once.
I do great progress in CR too. Tell the true I can make a mistake in CR question only if I do not understand argument or question. I do correctly ~70% of LSAT RC questions, but my performance in GMAT RC fare worse.
My main problem in math and in verbal part is lack of time. But I hope caffeine helps me do all test in time in upcoming exam. In real exam that I had in May due to caffeine finished math part 5 minutes before time ended.