Hi everyone, Just wanted to ask for some advice on what I might be doing wrong here.
So I've been studying GMAT full time for the past 7 months, and have seen my score improve significantly on the practice tests. Here are my stats for all 6 of the GMAT official practice tests:

12/12/20: Q47/V36 - 680
15/12/20: Q47/V39 - 700
25/12/20: Q45/V32 - 640
29/12/20: Q47/V39 - 700
03/01/21: Q48/V42 - 730
08/01/21: Q48/V41 - 720
However, on two attempts at the online GMAT I received:
17/12/20: Q35/V35 - 580!!!
11/01/21: Q40/V35 - 620

I've taken ALL of these practice tests in exam conditions (Don't look at notes obviously with no breaks) and just for some context, I've exhausted the OG verbal and quant practice questions (revised all of which I answered incorrectly as well), and finished Target Test Prep for quant and The Economist courses.

I am so frustrated to get these scores as I believe I am able to reach that 700 mark, but I definitely experienced test day anxiety that may have affected my performance on the actual exam. For quant, when I am answering harder practice questions I could always do so with confidence whereas in the exam I seem to struggle over even the simpler ones.

Since I have taken both Online exams, It seems that my only choice is to retake the GMATs in an official test center, which I am quite nervous about as well due to the pandemic (that + there's an AWA section I've never practiced for). Would anyone be able to give me some advice on what to do going forward? Should I retake the official practice tests again or try some from a third party (I finished Veritas Prep's practice tests, but maybe a different one?)

Also, if anyone has ANY kind of idea as to why my practice scores and my real scores have such a wide discrepancy, please let me know

Thanks!