Hi Sanya,
When studying for the GMAT you should keep two things in mind:
1) It is a test of how efficiently can you solve the questions in a given time frame
2) how fast can you reach an approximate value to get to the answer.
Therefore, the test assesses your confidence and agility.
I would recommend Sandeep Gupta's Top One Percent for the same. Sandeep focuses on a wide variety of questions (all of which have ether appeared on past GMAT tests or those that are part of the mock tests. Thus, all questions you see are basically prepared by psychometricians, who will catch every small "logic error" you make. I used to find the verbal section more tricky than quant, because I take time to read a log paragraph to be able to fully understand it. However, as part of this course, I have learned how to steer through the grammatical and extremely lengthy paragraphs and actually steer clear through them.
In the quant section, Sandeep focuses on finding tricks to get to the first step in each section, which is the most crucial.
In short, een if you are of the mindset that you just need a 700+ score and aren’t aiming for 760+, choose Sandeep Gupta because if you can master even half the concepts he has to offer, you wouldn’t have to worry about a 700+.