Hi Inseadshri,
Welcome back to GMAT preparation! It sounds like you have a solid plan. I like that you are planning ahead:) It helps to schedule all of your GMAT study sessions. It also helps to lay out ahead of time what you will study each day so that you don't have to think about it. It all comes back to setting goals which is also very important on GMAT questions. If you want to have an idea of what a schedule might look like you can have a look at my site - I am in the middle of building an 11 week GMAT schedule for self-studiers like you. Here is the intro to the
GMAT schedules. Maybe that helps to give you some ideas.
The other thing that I would do is read a challenging article every day. Over three months that will make a real impact on your verbal performance. I recommend reading the Economist - here are some things to focus on in your reading so that you practice being an active reader:
using the the economist to improve GMAT reading comprehension. The
MGMAT guidebooks are a good idea, especially for brushing up on Quant and Verbal strategy. For verbal practice though I would avoid any non-official questions. I haven't found any sets that I like. Stick with the real stuff. There is a lot of it (OG 13, Verbal Review, Question Pack 1, GMAT Paper Tests, GMATPrep Question Bank, 10 FLTs). If you need extra practice go with LSAT rather than non-official GMAT.
Once you get back in the swing of things I would suggest the GMAT Club Quant CATs. They are super tough but for strong math students these tests are extremely helpful for getting 49+ on the Quant.
Of course there is a ton of great advice on GMAT Club as well. Good luck getting started!
Happy Studies,
A.