If you just took official Practice Test 4 in Bluebook and you want to know how to solve the ones you missed, this is the video for you. Every one of the 44 math questions, solved start to finish in real time. No cuts, no edits, no script. Just the fastest route through each problem, which on this test very often means Desmos instead of algebra.
How to Actually Use a Walkthrough
The wrong way is to watch all 80 minutes like a movie. Watching someone else solve problems feels productive, but it builds almost nothing on its own.
The right way takes three steps. Take the test first, timed, in Bluebook, under real conditions. Then score it and pull out every question you missed or guessed on. Then jump to exactly those questions in the video and, for each one, answer a single question: could I have recognized this setup, and did I know the move?
If the answer is no, that question type goes on your drill list. Miss it, understand it, repeat the type until you recognize it on sight. That loop is the whole engine behind the full 800 plan, and a walkthrough is just the fastest way to see what the move should have been.
Watch How Often Desmos Does the Work
As you go through the video, count how many questions get solved with no algebra at all. Type the equation in, read the answer off the graph. Systems, quadratics, medians, intersections. If you have been solving those by hand, that is minutes of test time you are giving away, and the Desmos advantage is the single fastest thing to steal from this walkthrough.
What to Do After Test 4
Here is the problem with official practice tests: there are only eight, and retaking one you already did does not measure much, because you half-remember the answers. Whether you know it or just recognize question 12 is impossible to tell.
That is exactly why we built our practice tests the way we did. Sigma Prep has a mock version of Test 4 modeled question for question on the real one, same format, same topic distribution, same difficulty curve, but with brand new problems. It comes in three versions, so you can measure yourself on Test 4 material three separate times and every sitting is a real measurement.
The Test 4 mock is the free one. No card, no payment, take it today: full-length timed practice tests. And when you have burned through all the official tests, we wrote a full guide on what to do next.
Every question on the mock comes with a video explanation too, so reviewing your misses works the same way this walkthrough does, except it jumps you straight to your exact problem. Start free today!