as an aside, which tutoring service do you guys think is the best for someone who is starting to study for the exam?
Just my 2 cents:
1) Get the Manhattan gmat quant strategy guides(5 in total),Manhattan gmat SC Verbal guide/RC guide, Powerscore gmat CR bible
2) OG 11 or 12
3) GMAT PREP EXAMS taking it over and over again and getting yourself familiar with the question types.You can find the solution to almost all gmat prep questions on this site(may take some time to search) In addition visit this site and Manhattan gmat site for more gmat prep questions. GMAT prep is the closest to the real deal and have no doubts about it.
4) For additional practice Manhattan gmat exams (5 in total) which u get for free if u buy even one of their startegy guides
To answer your question I would defnitely suggest you to start off with just Manhattan gmat quant strategy guides(
www.manhattangmat.com) as they cover the basics also.
Regards,
CR