Is the clock on test different from any other normal clock???

Hello GMAT club users,

This is my first post here. I would like to thank the creators of this forum for creating this.

Coming to my point, I am an average working class guy trying to pursue my dream of getting into a decent B-school. I have put in a solid and focused 400 hours into GMAT preparation so far.

I consider Quant my strong suit. In the three practice tests that I took so far, my quant scores are 49, 50, 50. I am still working on my quant to get to the 51 mark.

My verbal scores from each of these three tests are 24, 28, 28.

For the past one month, I have been solving OG questions both quant and verbal and I have been consistently scoring >90% on Easy level >80% on Medium level and >50% on Hard level in all verbal questions with clock under 1:30 for each question.

The most recent practice test I took was yesterday and was from GMATprep. I scored a 650 (Q50, V28). I panicked before I even got to the half way mark on verbal and the clock took over the better off me and I just lost it after that, ending up getting most of the second half of verbal incorrect.

I have my GMAT in 35 days from now. My target is 750. Should I just postpone the test and restart practice all over? I don't understand where I went wrong. If so, what is the strategy you would recommend?

Please advise. All your help is highly appreciated.

Thanks,
A GMAT aspirant