Thanks a ton, UMB and Botirvoy. I appreciate your help.
Even though I have been a bright student, must mention that English is not my mother-tongue and have not been into maths after high school. I cannot spend more than 3 hours a day for GMAT. I want to give best shot to GMAT at the same time will be satisfied with 650 -700 score.
I do not want to confuse myself with books more than one on each section. My pick for OG and Manhattan for language is based upon reviews here in this forum. As for maths, I do not want to go extensive; am thinking about Kaplan
math work book as Manhattan 3 books out of 8 books set seem to be too deep am I right?) and not sure if OG would help me clear concepts apart from giving good practice tests.
If you want to use as few books as possible without compromising efficiency, buy all Manhattan GMAT
7 books and OG. MGMAT comes with online access to 6 GMAT CATs, which are second best to GMAT Prep.
Take diagnostics test and see where you stand BEFORE putting prep plan in place.