Take a look at the link in my profile, the "Studying Verbal Starter Kit." It's a list of videos and blog posts that lays out some major verbal content and strategies.
Your improvement in verbal is best demonstrated by your ability to explain why right answers are right and why wrong answers are wrong, specifically, based on the text that is written. So in SC, "sounds bad" doesn't cut it (even if sometimes in the test, you have to use that reason for time).
Also, try to build from the easiest questions up. You're going 90% on the easiest, but you want to get to a point where those are basically 100% accurate. Then on the 70-80% on medium, you want to be 90%+. You get way more punished for missing easy on the GMAT than you get rewarded for getting hard questions.