Why do I solve SAT math correctly and still get it wrong
It shows up as an equation to solve. The question asks for something other than x, such as 2x minus 3, or x plus 4.
The trap
The student solves the equation correctly and reaches a value for x. That value sits among the choices, so the student picks it. The work was right and the number is there. That choice was built out of that moment. Another choice waits for the student who stops one move early. Another waits for the one who does the steps out of order. The wrong answers contain no algebra errors. Each one is the correct procedure with its last step missing or out of order. That is why the wrong answer feels earned. It is the student's own work, unfinished.
The rule
The procedure has a defined end, and the question names it. Finish every step. Then check that your number is the one the question asked for, not the one that appeared first.
Desmos
Technique 1 from the Desmos Strategy Guide. Type each side of the equation as its own line and click where they cross. That puts x on the screen in seconds. The trap is then exactly where it was, because that value of x is one of the choices. Desmos does the solving. The finishing is still the student's: evaluate what the question asked for before looking at the choices.
If it keeps happening
If this one fires on three practice tests running, the student is checking the choices, not the procedure. The fix is a habit: reread the question before choosing. It is the most common Math trap in the easier second module. For a student between 1200 and 1400, it is the first thing we would fix. In the 1000s, it is the first trap after the foundations.
Start with the free Diagnostic.
One short form. Within 24 hours you get it in writing: where the score stands and what to fix first.