Two weeks into preparation, and panicking a bit!

Hello,
So as the title suggests, I am panicking a bit.

I am two weeks in, studying from the Manhattan Strategy guides. I gave one MGMAT and got a 660 (Q45 V35) on the test. So far, i have been able to complete one book from the MGMAT guides for Quant and solved all OG questions for the F-D-P (around 100) of them. Fairly OK with the questions, just a few silly mistakes that don't click. Will come with practice. I am certain Quant is something I should be able to get through with another 2-3 weeks of studying.

Verbal is another story altogether! I need a good score here, to get my goal of 750. Why do I need 750 you ask? Well, two reasons, my GPA is low (2.8) and I am aiming for Top 20 schools (check my list on the side).

I started with SC from the MGMAT book and 3-4 chapters in, I am a little lost. Not sure how to get through Verbal right now.

I need some advice guys. My test is on 10th Sept, which is 10 weeks, to the date, and I cannot push it further. I aim to apply in R1 to at least 2-3 schools, and if needed, in R2 to another 2 schools. Planning to take the last 2 weeks off from work for the last mile push.

I am able to put in 15-20 hours a week, 2-3 hours on weekdays and 10 hours over the weekend, with a rest day on one day of the week.

Regards,
Anupam.