Big delta between actual and official mock. What's going on?

Hi,

Long time lurker here, I took my first GMAT exam this year in early June after 2 month of prep and got a 610 on actual test day. But I was not very surprised as I understood the scores from the last 2 mock exam I took were inflated. However, I took my 2nd exam late June and was shocked to find out that I only got 610 (V30, Q44) despite a 720 on on mock #5 just a few days before the actual exam. This hit me very hard and I almost wanted to quit GMAT all together. But part of me want to know why and part of me telling me that I am so close to my goal that I shouldn't quit all together yet. I was a bit nervous walking to test center and had 6-7 hours of sleep the night before and was feeling ok. Overall, I still felt pretty calm throughout the exam. What's going on? Is this just bad luck or am I just bad at testing the real thing? Should I get profession help or even test anxiety help? Or is my fundamental still just lacking by a lot?

My official mock exam scores are as follow (the mocks are about 5-7 days apart):
March 2022 Mock Exam 1 (610, V34, Q40)
May 2022 Mock Exam 2 (640, V35, Q43)
May Mock Exam 1 reset (670, V36, Q48)
May 2022 Mock Exam 2 reset (690, V38, Q45)
June 2022 Mock Exam 3 (660, V35, Q47)
June 2022 Mock Exam 4 (660, V33, Q48)
June 2022 Mock Exam 3 reset (720, V42, Q46)
June 2022 Mock Exam 4 reset (660, V39, Q43)
June 2022 Mock exam 5 (720, V44, Q45)

I think there could be two reasons why my Quant declined while verbal improved towards end of June.
1) From March to May, my prep was leaning more towards quant (80% time on quant and 20% on Verbal) which I think explained the higher quant scores on mock in May and earlier June. I switched the focus from Quant to Verbal (90% of my time) in last 3 weeks in June which probably led to the decline of quant.
2) I was frustrated with my lack of progress on verbal so I switched the order of exam by taking Verbal first rather than Quant in 2nd half of June and saw a big jump in my verbal score. I think this might be that I lack the mental stamina as I find it difficult to concentrate on verbal especially on CR and RC (where attention to details matters) after completing quant first. I noticed significant improvement in CR and RC (on average, I only miss 1-2 questions from each of these two question types).

I have been using TTP and OG for primary prep materials. TTP has helped me a lot on quant and SC. I do keep an error log and review them each week.