Reddit reviews GMAT Sentence Correction (Manhattan Prep GMAT Strategy Guides)

750 or above is 99% percentile - it will require months of studying almost daily. If you have the will and dedication for it, it is possible. It's not going to be easy, but if you check success stories on GMATclub or other forums, you will find people who have done it.

1. What is your breakdown for Quant and Verbal?
   
2. Do you know what type of questions you got it wrong on both sections?
   
   For verbal, I suggest:
   

1. Powerscore Critical Reasoning
   https://www.amazon.com/PowerScore-GMAT-Critical-Reasoning-Bible-ebook/dp/B00A413J4O
   
2. Manhattan Prep Sentence Correction
   https://www.amazon.com/Sentence-Correction-Manhattan-Strategy-Guides/dp/1941234070/ref=dp_ob_title_bk
   
   For Quant:
   
3. Manhattan Number Properties, Word Problems, and Geometry are very useful
   
4. Kaplan Prep Plus helped me a lot with probability and combinatorics.
   
   
   

You could look into the GMAT Prep book for writing. I bought the GMAT Prep books and I think the Foundations of Verbal would help you. Other ones that would be good for you are Sentence Correction and Integrated Reasoning and Essay. I've linked them below.


Foundations of Verbal

Sentence Correction

Integrated Reasoning and Essay

You can also search for free prep on Google. There are TONS of websites with practice problems and essay questions. All I had to do was sign up for free and I had access to loads of stuff. And there are a lot of forums with people in your situation or people that were in your situation that give insights to succeed.

Nice, thanks for the feedback! Does this look like the one that you used?
https://www.amazon.com/Sentence-Correction-Manhattan-Strategy-Guides/dp/1941234070/ref=sr_1_1?ie=UTF8&qid=1505748545&sr=8-1&keywords=manhattan+sc+gmat+book