GMAT Strategy

Hi experts,
I would like to know whether I am studying verbal in an appropriate way to excel.

RC
I paraphrase each paragraph into one sentence ( if possible). By doing so, I know the main idea, author's opinion, and even come back to tackle the specific/detailed questions.

CR
wow, this part is blowing my mind. I thought I knew but I guess I don't.
Following are the strategy/technique that I use.

Weaken
1. find the alternative factors
2. If X happens, then Y might not occur.
3. If X happens, then Z(unexpected factor) will/might occur.

Strengthen
1. Enhance conclusion part by providing examples, using data or survey,...etc.

Assumption (GMAT CR bible)
1. Supporter- find the assumption or fill the gap that links between the premise and the conclusion.
2. Defender- eliminate ideas or assertions that would undermine the conclusion.

and I think I am fine with other types of question. (these are minors, may be 2-3 questions. but weaken, strengthen, assumption play a major role in the most of the CR section.)

SC
wow, this is another mind-blowing game. I use manhattan gmat SC book and I think it is fantastic. I got more than 93 percentile on OG SC part. However, it was a little hard for me to solve the SC during a real test. What is the problem with this?

Since I used all the materials, it kinda kills me going over those books again. Because I knew the answers already.

These are the books that I studied for and have to study for again.
OG 11
Verbal Review
PrincetonReview
Kaplan 800
Gmat Critical Reasoning Bible
Manhattan SC, CR, RC
BTG website
What do I need to improve?

by the way, I got 5.5 on AWA. so I am that stupid.

Please share the strategy/control mind/technique with me.

thank you.