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 #16 on page 77 that begins: “The median of the numbers in list R is how much
greater than the median…”
Verbal: Section 3, Question #16 on page 56: a Sentence Equivalence question that begins, “While in many ways their personalities could not have been more different—she was ebullient where he was glum, relaxed where he was awkward, garrulous where he was…”