Amazing resource!

Experts’ Global’s test series of 15 brilliant mock tests is the highlight of their wonderful GMAT learning application. These tests are similar to GMAT in all ways and form a great pool of awesome questions with some nice analysis features and a scoring algorithm that gives a very reasonable estimate of one’s true preparation for GMAT.

Their sentence correction book (a set of ten e-books, to be precise) is the most complete GMAT sentence correction resource, bar none. Every concept in covered in excruciating detail. Going through these e-books tremendously improved my sentence correction performance.

Experts’ Global also has a collection of ~200 short videos, called the GMAT shots. These two-minute long videos are great for refreshing the GMAT concepts, whenever you have time and also have a lot of excellent test-taking advice.