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 #19 on page 78 that begins: “From 1988 to 1991, which corporate sector decreased its support for the arts by the greatest…”
Verbal: Section 3, Question #19 on page 56: a Sentence Equivalence question that begins, “Economic competition among nations may lead to new forms of economic protectionism that hearken back to the mercantilism of an earlier age…”