Massive difference in mocks and the original GMAT

Hi fellow aspirants/mentors,

Hope you're all doing well!
A slightly long post that might affect the number of people who could reply to this post. But i feel i must present all the details that, i feel, could help you advise me better in this seemingly endless war against GMAT. I'll cut to the chase.

I'd left the exam center after my first GMAT attempt with a score of 650(Q48 V30). Quants felt reasonably okay back then, while Verbal was pure chaos. I remember marking random answers just to catch up with the timer. I remember skimming through the options for critical reasoning without really trying to understand and eliminate wrong options. After the test, I was convinced that I could be having a much better score in my next attempt if i spent enough time and attempted more mocks. (I had consistently scored 680-720) in the mocks prior to my first attempt.

Two months later, i would go on to give my second shot at GMAT to try and end up with a score that starts with '7'. That fateful day happened to be yesterday. I was a lot more confident this time. I had given all six official gmat mocks. I had improved my RC and CR significantly while my SC was on a fairly decent level all along. I had improved my accuracy in DS as well. Most importantly, this time, I had a bag of 700+ scores in ALL my official mocks( Most of them in the 730-760 range). I was finally beginning to mark my answers in verbal with confidence and the timer issue in verbal wasn't a problem anymore. I had familiarized myself with the gmat test-day processes to prepare myself best for the occasion.

On the day of the exam, there were no surprises. I could sense that they were testing me on quants but i was up for it. For verbal, I had trained myself to focus on the question at hand instead of thinking about all the other external factors like accuracy, difficulty level, test pace, etc which I managed to build over the course of the two months of giving mocks. That approach had helped me cross the 700 barrier consistently. I ended the verbal section brimming with confidence and an unparalleled relief since I had not sabotaged my verbal attempt, like i had the previous time.

And yet, I ended up with a 650 again (Q50, V28). I was consistently crossing V35 in my mocks and didn't even feel like I had a bad test-day. Has anyone undergone a similar experience? I really feel like i am knocking on the door for the 700+ score but I am missing something . I'm open to ALL suggestions and ideas that can help me overcome this problem at the earliest.

Thanks,
MKAK