SAT Strategy
10 Common SAT Mistakes and How to Avoid Them
Ten SAT errors with concrete examples and checks: requested values, signs, punctuation, evidence, percentages, pacing, review, and obsolete test advice.
An SAT error is easier to prevent when you name the failed step. Use checks such as labeling the requested quantity, substituting an algebra answer, identifying complete clauses, and locating text evidence. "Be more careful" does not tell you what to do.
1. Solving for the wrong quantity
If the question asks for and you find , entering 4 loses the requested final step. Write the requested expression on your scratch paper before solving, then fill it in: .
The same check catches percent problems asking for the amount of increase versus the final amount. Circle or restate what the answer must represent before choosing a method.
2. Dropping a negative sign
In , distribution gives , or . The negative multiplier applies to both terms. If you write , test : the original equals 5, while that expansion equals .
Substitute a simple value into the original and rewritten forms when a sign-sensitive step is uncertain. This checks equivalence without redoing the entire problem.
3. Treating percent change as percentage points
A rate rising from 20% to 25% increases by 5 percentage points, but its relative increase is , or 25%. These answers describe different quantities.
When the question asks for percent increase, divide the change by the original value. When it asks for percentage-point change, subtract the two rates.
4. Trusting an unchecked calculator entry
A correct graph can answer the wrong equation if you entered the model incorrectly. Before reading an intersection, compare the expression list with the problem. Afterward, check the requested coordinate or expression.
For and , the intersection is . If the question asks for , the answer is 10, not either coordinate. Calculator output still needs interpretation.
5. Choosing a comma by the pause
A spoken pause is not enough to choose punctuation. In "The sample was small; the estimate was uncertain," both sides are complete clauses. A comma alone would create an incorrect join.
Locate subjects and main verbs, then decide how the clauses connect. This also helps you reject a semicolon when the words after it are only a dependent fragment. See the punctuation guide.
6. Choosing a transition before naming the relationship
Two sentences may show contrast, cause, an example, or continuation. Decide which relationship is present before comparing transition words. "The first method was expensive. The replacement used inexpensive materials" supports a contrast.
An impressive-sounding word does not make the logic work. Substitute the transition into the exact sentence and check that its relationship matches the information.
7. Adding a claim the passage does not support
A passage saying a treatment helped one studied group does not establish that it helps every population. Check words such as "all," "always," and "only" against the actual evidence.
For inference questions, choose the conclusion the text supports, not a related fact you know from outside reading. The inference guide gives a fuller method.
8. Spending too long without a next step
Working longer is useful when it produces another equation, elimination, or piece of evidence. Repeating the same unsuccessful action while unanswered items remain is a signal to move.
Choose your best answer, mark it, continue, and return within the module. Practice this before the exam so moving on does not feel like a new tactic. Unused time does not carry to the next module.
9. Counting a guessed-right answer as learned
A correct answer chosen between two unexplained options needs review. Cover the explanation, solve again, and explain why the competing choice fails. Then use a fresh question testing the same skill.
Answer-letter memory can make a retry look successful. Check the reasoning instead. The practice-test review guide includes a compact error-log format.
10. Using an obsolete rule for the current test
An old book can teach algebra while giving obsolete format advice. The current SAT permits a calculator throughout Math, adapts between modules, and does not use a universal points-per-miss conversion. Current handheld-calculator restrictions also prohibit CAS.
Confirm rules with College Board and rehearse in Bluebook. Use your review to choose one or two checks from this list for the next practice set. Trying to apply all ten consciously on every question would create its own pacing problem.
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Luke Finigan is a student developer and the creator of 1600.now, a free Digital SAT practice platform. About Luke.