Scored 460 and 530 on GMAT Prep 1 2 Need Help

I have been studying on TTP since June 2022, after switching from another prep course, after last year's disaster mock scores scoring 400 in March month and 360 in May month, I have been studying extensively every single day since mid-June till today on TTP and giving my best to the course by putting in 6 hours a day to understanding the content and 1 day whole to solve problems.

I was not able to replicate any similar successes in the mock exams and this has lowered my confidence and self-esteem, I don't work full time or have a job in my hand so I focus on studying GMAT every day, I have also solved multiple questions in OG and have confidence in solving them, but the test stress has made me flunk the exams, I have only focused on GMAT for past 400 days since January 1, 2022, when I initially scored 310 in my diagnostic test of the different prep course I used before switching to TTP.

I have been focusing on both Quant and Verbal. I got in touch with Marty by email one day in June before switching to TTP.
I am able to understand every single thing on the course and replicate multiple successes in the practice tests in the course. The main concern is that I focused on the exam all my time preparing for it and on the day of the exam, I get multiple strings of questions of medium-level easy level questions wrong and thus I am scoring lower, I know the concepts but I am not able to give the exam the justice it needs.