There is a new test prep company in town - Preped. Surely the tutors here provides excellent quality output that users can even study (with text and video explanations of the answer) at the same time, answering questions that looks similar with GRE.
You may start answering with their free practice tests, or check them out in Youtube!
Preped also provides an exclusive GRE Vocabulary App for free, download it here: PrepEd GRE Vocabulary
Hope this may help you :)