I'm using OG11
to study for the test and noticed there's a pretty thorough section covering various quant and verbal areas (probability, numbers/primes, idioms, etc). Is that good enough to cover pretty much everything the gmat offers or should I buy supplemental materials?
this is aimed at people who have used OG10
/11 and taken the gmat, but any feedback would be great.
the math review section literally covers EVERYTHING you need to know for the GMAT.
STILL, it is helpful to buy a test prep company's books (i think MGMAT is great) because the GMAT finds LOTS of creative ways to ask you questions about what is contained in the review.
The verbal review isn't really good enough. Definately buy PowerSCore or Manhattan sentence correction