GMAT Strategy

I started with the Diagnostic Test in OG12. Before starting, I knew I have to concentrate on verbal first and so I only gave the Verbal Part of the test. As per the interpretive guide, page 45 OG12, my scores were:
RC: Below Average-- disliked this from childhood
CR: Above Average-- read about GMAT CR sometime back, also had tried few in past
SC: Above Average-- read about GMAT SC sometime back, also had tried few in past

Clearly, the main focus is RC.

So, I read OG12 instructions. Got Manhattan GMAT, RC Guide 4th Edition from a friend.
After completing it religiously, I also peeped into Manhattan GMAT Online session of Short and Long RC. And then started with RC of OG12.

I got 45 wrong answers out of 139 total questions, scattered in 24 passages.
I found that I was able to apply few strategies, but this result seems a very low to me.

Now having done RC from OG, and getting a not-to-good-output, I am confused what to do next.
Keep working on RC(but how?) or move on to improve SC/CR.

Please advice. I have also analyzed the results of every question/passage/type/subtype in a excel(was doing it after every passage)
Can upload it if the experts want to see