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.
Please reply.