Hi,
just finished my GMAT and would like to give you a few valuable tips that might save you a bit of time during the preparation. I prepared one week full-time for the test and 2 - 3 weekends.
I used the following sources:
Maths:
-
OG 11: good to brush up basic maths but too easy in comparison to the real thing - did about 200 questions out of the book
- Manhattan GMAT:
A must read!!! Excellent to get the math
theory in your head as well as a lot of very useful
shortcuts. Intensly studied the following three books: Word Translations, Number Properties, Geometry, no others.
- Gmatclub Math tests: those were by far the most valuable source of math exercise - highly recommended as they are similar to what you see in the real thing in terms of difficulty
- Forums: did about 150 - 200 forum questions on Gmatclub and here on testmagic. Very very helpful!
- Combinatorics: an excellent thread on gmatclub on that (it is sticky on the top)
- Kaplan 800: Did a few questions, but didn't find it that helpful I have to say.
Verbal:
- I didn't do any prep for Verbal part except reading
The Economist which teaches you all the grammar & style you need (I am non-native english) + it is actually interesting compared to the other gmat preparation

) Also it is a great way to prepare for the logical reasoning and the "story" questions as you teach yourself to read with a higher level of alertness.
- General advice: Watch out for modifiers and parallelism in SC which are tested in 80% of the SC questions
Practice tests:
Did each of the
GMATPREP 2x and got 730/760, 710/730.
Princeton Review Prep: got 670 (wtf??)
Actual test:
The actual test was much harder than the
GMATPREP on the math section but way easier on the verbal. I guess this difficult to generalise though, as it may vary a lot from test to test. Make sure you don't spend too much time on some math problems, set yourself and absolute max. of 3.5min (some do require that time), but no more.
Anyway, am happy with my score and hope this debrief helped.
all the best