760- This peaceful, easy feeling, GMATClub material rocks!

You are welcome, Mandeep.

I have no idea about the maths book by Jeff Sackman as I have not used it.

I would suggest:

For building your base: All Manhattan GMAT maths materials and the GMATClub Online Free Maths Book

For taking tests and developing your quants test taking skills:

Thw two GMATPrep practice tests (they are pure golddust) - once done, pls reistall and take both tests again given the question bank is quite exhaustive

I personally did not like the MGMAT quant sections though they are good for practice because they are definitely tougher than the actual test and also, inflate the scores to a degree.

Pls go through the GMATClub Diagnostic test at least twice.

I liked the PlatinumGMAT online free GMAT practice test and the Quants section in it

Also liked the Knewton, Veritas and Kaplan free tests

You should also go through the 2 documents published by Bunuel (one for DS, the other for PS) - specifically, the DS questionnaire was very helpful for me.

For advanced practice, others here have recommended GMATClub Maths tests, though I haven't used them.

Please bear in mind that: Reviewing each question that you did not understand, understanding it and solving it again is absolutely essential, whichever book you follow.

Santanu