Advice targeting 700+

What’s up everyone,

I’m planning to take the test in late September. I started studying about a week ago, and right now I can do around 2–3 hours a day, a bit more on weekends. About a month before the exam, I’m planning to increase that to ~5 hours/day if needed.
Before starting, I took an official mock (completely cold, didn’t know anything about the exam) and got a 455. I was pretty disappointed. If I remember correctly, I was around 50th percentile in Quant, ~35th in Data Insights, and Verbal was the worst, 2nd percentile (which honestly shocked me haha).
My question is: is it realistic to reach the 700s from here? I know hours ≠ performance, so I’m mainly looking for advice on how to study effectively and structure a plan.

I have access to TTP and the official guide (with the question bank). Would really appreciate any tips or suggestions.