Best Verbal Study Material for Non-Natives

I took the verbal online course 6 months back, and this course has been very beneficial in my preparation. My area of weakness was the verbal section of GMAT. E-GMAT diagnostic tests helped narrow down the sub-topics that needed more attention.
My performance in mocks has also improved. There has been a drastic improvement in my verbal ability especially for Critical Reasoning and Reading Comprehension. I am still polishing my skills in Sentence Correction before I plan to take further mock tests
This ability quizzes are part of the Scholaranium tool offered by e-GMAT which gives the true estimate of your weaknesses by providing detail statistics. Also, for each attempted question you get analytics of the percentage correct attempts and the average time spent for each question. This quite helps in assessing the time we spend on each question based on its difficulty.
I will surely recommend this course to GMAT aspirants.