Being a non-native speaker, I was literally struggling in verbal and my score remained stagnant for quite some time. After analysing mock tests, I have realised that SC was my pain point. Looking desperately for help, I came across e-GMAT's Verbal online course and went ahead with it.
I religiously followed the SC approach explained in the concept files and within no time, my Verbal score increased significantly. e-GMAT has helped me structure my approach towards verbal and played a huge role in improving both accuracy and speed.
I will recommend e-GMAT's verbal online course 11 out of 10 times if you are struggling in verbal (especially sentence correction).