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 #8 on page 74: a Quantitative Comparison problem about x > 1:
Verbal: Section 3, Question #8 on page 53 that begins, “The question of (i)_______ in photography has lately become nontrivial…..”: