Based on my experience with thousands of students in recent years, the test questions are getting harder and changing quickly and those resources are not up to date. Either Kaplan or Manhattan does not depict the real GRE test questions. Let me give you an example:

For example, if you look at the manhattan questions, either in their books and mocks, you would see a very difficult vocabulary is used in all the practice questions. However, in the real Test, the emphasis is on the contextual understanding of the complex English.

For Verbal Practice, I would highly recommend the original test-makers ETS.org and also if you want to try free trial then you should utilize +500 practice questions of ScholarDen on www.scholarden.com.

The best feature of Scholar Den is that their questions provide you the real GRE experience and guarantee to help you improve the scores.