Drastic score drop in mocks 2-Days Before exam

My exam is just 2 days away and my preparation is complete.

I am a working professional and have been preparing for the GMAT since 3 months.
I bought the e-gmat study material and started my preparation.

I gave a mock just to asses where I stood after familiarising myself with the topics and question types .

GMATprep1 - 620(Q49 V26)

I was confident about my quant skills and needed to work on verbal.
My goal from the beginning was to score around 700-720.
So making some calculations my target was Q50,V34-36.

I went through e-gmat material and the OG simultaneously and found e-GMAT really very useful.
I was confident that my skill level was increasing.

I finished most of my preparation 2 weeks before my GMAT and started taking mocks.(I did realise that i was taking really long in my RC's)

I gave my first mock after preparation and scored 670

I gave a number of mocks because I realised the problem was not in my skill level , but in my time management.

GMATprep 2 -> 670(Q50 V29) --> timing issue
GMATprep 3-> 640(Q50 V27) --> timing issue
GMATprep 4 -> 690(Q50 V33) --> bettered my timing and handling
GMATprep 5 -> 700(Q50 V34) --> Timing bettered but still not up to mark (I had to mark 1 full RC as C)
GMATprep 6 (Two days before my exam i.e today) --> 620(Q49 V26)

What the hell were my 3 months for when i scored exactly the same as my first mock.
Note :- I was reasonably fresh and motivated.

On analysis I found that I got 9/14 RC questions incorrect.
I was bad at RC but usually manage to get 50% of the questions correct at least . And these RC's were probably not so tough either.

Too many RC's incorrect completely ruined it.

Let's see how much i score on the actual GMAT.
I am pretty chilled out and will spend tomorrow just revising my notes and reading some essays.

I will post in this thread ,my final score, day after.