I could approach my answer in a specific way and in a more general way. So, I try to go straight to the point and to be schematic step by step.
The general wayHere on the board you can see for each section the best links and sources seeing the sticky post or announcements at the top of each section/subsection (i.e. verbal forum/critical reasoning forum)
Look at this and read very carefully.
gmat-study-plan-how-to-start-your-gmat-prep-80727.htmlBest books
best-gmat-books-118706.htmlIm suggesting just two of the most useful links (just to point out) but i do not want waste time providing you links on links that you can easily find on your own.
I want instead give you some advice.
The particular way For quant part, in my personal opinion if you can afford the purchasing of a/more books I would advise you : TOTAL gmat math di sackman
Instead to buy several books
MGMAT and kaplan and this and that .....buy one and you have all you need. Really, Believe me. then try to have the OG 13th and do all questions even several times and for EACH question try to learn how it works, the way: what is the area of content it tests, the strategy to tackle and so on.....
And this
bunuel-signature-collection-all-in-one-with-solutions-146628.html#p1176711As for verbal.
SC In my opinion avoid MGAMT SC too convoluted, instead use Aristotle SC 3th edition if you can or take a look at this
meaning-clarity-sc-question-bank-by-carcass-souvik-145694.html#p1168341 and this
ultimate-sentence-correction-encyclopedia-147357.htmlFor CR Yet use Aristotle guide or look at this
critical-reasoning-megathread-145178.htmlFor RC. Perhaps this is the most diufficult section to improve, because you need time to rise your learning curve. RC is a sort of stratification to achive a really good point. Practice.
ultimate-reading-comprehension-encyclopedia-150022.htmlIts all for now. Ask whatever you wanna. We are here to hel p you.
Regards