Improve your English for Gmat. Winningprep.com offers great guidance for all those planning to appear for the Gmat. Apart from English it also offers help on maths and other subjects needed for Gmat.
Hey!
I’ve used this site - gmatphone.com
It offers free GMAT preparation questions to solve on your mobile! They only have a demo now, but that was enough for few days in the bus solving GMAT 
Hey guys,
I found that the best resources were:
- Manhattan GMAT Books (the best prep books for me)
- Free GMAT tests (knewton.com and MBA.com
- 2minuteGMAT questions (inexpensive and they were sent to me every day)
In the end, I think the best thing to do is just practice. It’s the best way to improve your score.
I also think Kaplan 800 is a great prep book. It’s definitely worth purchasing.