GMAT Critical Reasoning (CR) | Need help with CR - Especially Assumption questions

Hi everyone

Im terribly in need of advice from you for my Verbal, esp CR.

I took 3 practice exam already:
21/6/2016: GMAT Official Prep1: 680, verbal 34
12/7/2016: GMAT Official Prep 2: 640, verbal 30
1/8/2016: Manhattan Prep: 650, verbal 36 (this was a little bit higher but I guess it was because I have bumped to lots of identical exam questions from the shared resources and I kinda memorized the answers already)

So basically after 2 month I found no much improvement in my verbal. I got most
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