9 days for GMAT: don't know what to do!

I have 9 days left for the exam day.
I took another mock test(mgmat) today and got 630, and I am really upset.

I have searched almost every question on this forum to know if mgmat is harder than real gmat, but I did not find an answer

I took the gmat prep and scored:
630,640,710,730.
After scoring 730, I booked my exam.
I have exhausted OG questions. So, if I solve them again, I remember most of the answers so I can't analyse if I improved.
If i reset the gmatprep exams, I remember the answers.

I took two mgmat tests in the last 3 days and scored 620,630.
Today's was 630. I kept myself really calm and was confident throughout the test, and was really doing well! Despite that, still got 630.
Usually, i sit and review every question in detail after mock test. Today, I don't feel like doing it either. (Giving up feels!)

In both of the mgmats I got a Q46. I never went below Q48 in any of gmat prep exams(even in worst state of mind!). V has been varying between 31 and 35 in both gmatprep and mgmat.

and I have a serious issue with RC, while practicing from OG(with timer) I am doing well.
in gmatprep tests I have avg score in RC(about 60%)
but in mgmat tests RC score is horrible(33%)
is RC in mgmat harder? I found them too detailed. and in my last mgmat test I got 3 RCs which were horrendous, long(really long!) and had lots of details.
Can this happen in actual GMAT??
mgmat is taking a toll on my confidence.