Do the set of practice problems at the end of the Algebra chapter on page 235 of the Official Guide to the GRE General test. The playlist below provides my video explanations to these questions.
Additional algebra homework from the Official Guide to the GRE starts on page 153.
SET 1 Discrete Questions Easy (page 155): 4, 6, 9.
SET 2 Discrete Questions Medium (page 160): 1, 4, 5, 7, 8, 9, 12, 14.
SET 3 Discrete Questions Hard (page 165): 8, 9, 10 [METHOD 1], 10 [METHOD 2].
The following practice problems are divided into easy, medium, and difficult levels. Do all of them or selectively attempt the ones that are appropriate for your current skill level. You can also watch my video explanations that are organized in a playlist below.
Easy
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