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 #12 on page 76 that begins: “What is the least integer n such that…”
Verbal: Section 3, Question #12 on page 55: a question on the passage about Russian serfdom that begins, “It can be inferred from the passage that the “rules and regulations” (lines 9-10)…”