All of official Practice Test 6's math section, solved live: every shortcut, every Desmos trick, nothing skipped and nothing edited out.
By Test 6, Sort Your Misses Into Two Piles
A few tests into your prep, not all misses mean the same thing anymore. Pile one is questions you genuinely did not know how to solve. Pile two is questions you knew cold and got wrong anyway: misread the stem, dropped a sign, answered x when they asked for 2x.
The walkthrough is for pile one. Jump to those questions and steal the setup and the move. But if pile two is more than a question or two, that is the more urgent finding, because once you are scoring 600 or above, every careless mistake costs 10 to 20 points. The fix for pile two is not more content. It is slowing down on the read and checking what the question actually asked before you answer.
The full review method is in the Test 4 walkthrough post, and the bigger picture is in the 800 plan.
After Test 6
Sigma Prep has a mock version of Test 6, modeled question for question on the real one in three versions, so you can retest the same material with fresh problems. Every question has a video explanation. The Test 4 mock is free: try a full-length timed practice test. Start free today!