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 #9 on page 74: a Quantitative Comparison problem about :
Verbal: Section 3, Question #9 on page 54 that begins, “The author of the passage would probably consider which of the following judgments….”