More RC study beneficial/necessary?

Hey guys I recently began my preparations for an early September GMAT. I started the RC section yesterday and worked through all the passages in the OG12 and the OG12 Verbal. I finished with about 95% correct on each book, most of these coming from "easy" passages where I made a few casual mistakes. I have the Manhattan GMAT RC guide but barely read it because I took the LSAT a few years ago and prepped for that intensely. I'm also a third year law student so I have read a lot of dense material during my time at school.

I guess my question is, should I go ahead and buy another GMAT supplement with non-official RC passages to practice more? I am considering just ending my RC studying (after only 2 days). I am very confident in my reading ability and timing even though I don't use a 'strategy'. Is there enough material for free online that I can just occasionally use to brush up my skills or are practice exams enough to keep me on my toes? My quantitative skills are definitely not as sharp as my verbal but I really need a stellar GMAT score to mack up for a lackluster GPA. Thanks for your help and the new layout looks great.