Tips for creating a scheduled plan to get a 685+ score on the GMAT

­Hi,

I have decided to take the GMAT Focus by May-June and I'm wondering how to plan my days out leading up to May. My current score is a 585 with a breakup of: Q77 V80 DI80. I would say I'm super weak in Quants, whereas for the other 2, I mainly need to work on timing and staying focused. I've decided to go over my Quant foundations from scratch once more and keep practicing questions in all difficulty levels (and all the 3 sections) on the OG and gmatclub because I figure these are the only accurate sources of GMAT questions available to me (I have other subscriptions to gmat courses but I do find differences between the OG and others so I'm not sure if that's just my lack of skill or if that's really a thing?).

I have a few books available. Could anybody vouch for any of these? Here's what I've got:

• Wiley's GMAT RC and CR
• Manhattan Prep (All)
• Kaplan GMAT
• The Princeton Review Math Workout
• Powerscore CR Bible
• Peterson's Ultimate Toolkit
• Brandon Royal RC
• Aristotle RC
• Veritas Prep (All)

It'd be very helpful if you could suggest an appropriate plan of action to maximise my scores. I'd started working on the Manhattan Advanced Quant problems but realised they might still be too difficult for me. When should I move to them?

This is the problem with having too many options haha. I don't have a clue where to focus my efforts and in what manner. I'd appreciate any help you can offer.