If you are fairly comfortable, you can skip initial problems in the supplement and attempt only last set of say 50-70 problems in PS, DS, CR, RC & SC as additional practice.

well here's what i think.
I started off with the the OG 11 and then I did the Official Quantitative Review and the Official Verbal Review. After finishing off the OG 11, when I went onto the Q review and V Review, I was expecting a bit more difficult and more comprehensive problems and explanations in them, just because they are entirely dedicated to individual sections. But I can safely say that if you have done the OG 10 and 11 then I would not suggest spending a whole lot of time on the Q and V reviews, just pick and choose problems from them. Or pick up some other material like Kaplan's, or MGMAT, or Princeton, so as to see the problems from a different angle or a perspective.

Thank you rangerguy2000 and sreak1089 for your kind suggestions, it was really very helpful... gud luck for your prep.