Going above Q45. Done with MGMAT. Dont know what to do

Hello!

I need help with my study plan. I took my first MGMAT practice test today and broke off the Q40 barrier for the first time. I studied GMAT 3 years ago while I was a senior in my university, and could not break Q40 in GMATPREP after 3 months of study. Today, I felt like a dirty toilet paper while taking the MGMAT test. In the middle of my test, I thought I was going to get a Q36 after all my hard work. I ALMOST stopped and went to bed. Now it is 1:40AM and I still couldn't believe I got a Q45. I guess that everyone here was right that once the exam really gets harder, your score gets better. But I can't stop at Q45, it is only 77% percentile. I want 85%

Here's my current dilemma:

I have exhausted ALL MGMAT books and its advanced sections. The MGMAT books are so well structured and well explained, I feel lost now that I've exhausted it. Any tips on how to study 650-750 problems? I have a very strict 2 hour study time on weekdays, and I will not feel productive if I lurk in the GMAT Quant section here for 2 weeks. But if you guys really suggest it, I'd do it. I just need to make good use of my 2 hours because I don't have much time in my hands.

The numbers that I was getting wrong in my MGMAT CAT were probably 25% of the 600level problems and 90% of the 700level problems. I was getting problems in the MGMAT test that had a big Hexagon inscribed in 8 small circles and their radius. How do people study problems like that? How do people get Q46 and above? I don't want to be stuck in this level again.

These don't appear much in the MGMAT advanced section. I don't know how to beat them.

I have exhausted the OG Quant, but haven't touched my new OG12. Although I am definitely going to finish it, I am not sure jumping onto the OG12 will improve my score. How do I go about it? Is there another book I can jump into?