Sentence Correction

As I am a non-native English user, so I suffered a lot in preparing for Sentence Correction. I have tried various other courses, but nothing helped.
I gave GMAT once before landed on 680, was looking forward to improve the score. I got hold of e-gmat verbal online, I can definitely state that a minimum of 40 marks improvement with serious and dedicated approach to the concept files , sessions, practices and questions would be achieved.
Also I do have hectic work-schedule, so the online mode of teaching helped me a lot. Also, it is very interactive and more of a TO-DO approach rather than to lecture. I do specially recommend a non-native speaker to sign the course.