Need advice

Dear GC members,
I am going through a hard time. My exam appointment is on 2nd April and I am flipping out. I gave an MGMAT practice test (untimed) recently and got 650. My scores previously have been :
680 GMATprep(in December, after a month of preparation of Quant) Don't remember the actual breakdown but Quant was around 49 and verbal somewhere around 30.
680 MGMAT(untimed) Q48 V34 January
700 Kaplan Q 50 V 33 Practice test January

I gave no tests in February and was on vacation for around 10 days. I have resumed my studies now(with work that I just joined),and these days I come back home and give MGMAT tests(untimed) in parts(completing Q in one day, v on another). I scored 650 on the last one Q49 V30(attached verbal analysis score sheet)
The problem is:
My Verbal fails to improve. I wasn't so worried about SC because it seems easy to me and my efficiency in SC has generally been good in the past tests. But yesterday's test has shaken me. My efficiency in RC continues to be pathetic. I get some 33% efficiency in most tests.

Books I have referred are OG 10 and 11;MGMAT SC;MGMAT RC; Powerscore CR.
I know I have gone through some very good material but I can't figure why I am still not improving.
For many questions the Official Answers were not even there in my contenders list. I am beginning to get worried.
Please advise me on my study plan for the next couple of weeks.