Great Verbal Concept builder-Egmat-SC in particular

I would strongly recommend the Egmat Verbal Live Prep for Sentence Correction, CR and RC sections. The course covers all concepts required for SC in particular very clearly. It also does good justice to the CR and RC concepts that will be tested on the GMAT. After completing the course, I would recommend that you develop a strategy that really works best for you to solve questions right in time( e.g. the way you read and work logically towards a solution may be unique and trying to adapt too much to some other way may reduce your speed and accuracy--I have found this to be true irrespective of the test prep company in the picture) . You will need to practice doing the questions quickly and naturally on your own after the concept building part from egmat. The people at egmat are very helpful and provide free extension services if your situation is genuine useful! The scholaranium is very good for identifying your weaknesses and targeting your preparation accordingly. I found the egmat verbal workship extremely useful as well - this is an excellent gauge of where you stand on the actual test with respect to score and difficulty. I believe it is the best prep source out there for non-native english speakers in particular!