Why do I keep second-guessing my answers on the SAT®?
Usually not because of nerves. You second-guess an answer when you chose it without a clear reason to reject the others. If your choice rests on “it sounds right”, any other choice that also sounds right can take its place. A rule for eliminating choices gives you something solid to stand on — and tells you when changing is justified.
Why doubt appears
Most students pick answers by recognition: this one feels like the passage, or looks like the kind of answer that is usually correct. Recognition is fast, but it gives you nothing to defend. When you look at the question again, a different choice feels right just as strongly, and there is no way to decide between two feelings.
Research on answer changing, going back decades, has found that when students change answers, the change goes from wrong to right more often than from right to wrong. So the advice “always trust your first instinct” is not reliable. The real problem is changing without a reason.
One example
A reading question asks what a study’s results suggest. The student picks the choice saying the results indicate that some birds may change their songs in noisy cities. Looking again, another choice says the results show that city birds change their songs. It sounds more complete, more confident. They switch.
What was true: the study recorded one group of birds in one city for one season. May was exactly the strength the passage supported; show went further. The first answer was right, and the switch was made by sound, not by a reason.
A rule to decide
Choose with a reason you can say in one sentence. “The passage says may, and this choice says proves.” “Both sides are complete sentences, so a comma alone can’t join them.” If you can say it, you have something to check your doubt against.
Change only if you find a specific reason. A word in the question you misread, a word in a choice that breaks it, a step in your calculation that was wrong. If the only reason is that another option now feels better, keep your answer.
Mark and move on. If you are genuinely stuck, choose, mark the question, and come back at the end of the module. Doubt that survives a second look with fresh eyes and no new reason is not a reason to change.
Why it helps to know your pattern
Most students who second-guess do it in one or two kinds of question, not everywhere. Look at the answers you changed on your last practice test and note which way each change went. If your changes in one question type keep going the wrong way, that is where you need a rule most.
This happens to a lot of people. What you don't know yet is whether it happens to you, and with which one. Sixteen questions will tell you.
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