Here’s another set of video explanations (one math, one verbal) of practice problems found in ETS’s Paper-based Practice Test for the Revised GRE, a PDF released by the test-makers themselves.
You can find the whole set of explanations for every practice problem here. Enjoy!
Math: Section 5, Question #7 on page 73 that begins, “Quantity A: The standard deviation of a set of 5 different integers….”:
Verbal: Section 3, Question #7 on page 52 that begins, “Room acoustics design criteria are determined…”: