I took my first diagnostic (Gmat Prep 1) on March 4th and got 660. I am an engineer and pretty good with basic mathematics. After one month of superficial preparations (Manhattan GMAT
strategy guides), yesterday I took the second test in GMAT Prep and scored 720 (49 quants and 39 verbal).
I can prepare intensively over the next two months. What is the right strategy to crack the 99th percentile. I have not joined any programs, and use only Manhattan GMAT
strategy guides, while I find it extremely good for verbal preparation, the quants section is pretty basic and not challenging at all.
What is the right strategy/tools/books/courses that can help me with my pursuit.