Do Standardized Test Scores Predict College Success? What the ACT and SAT Can (and Can’t) Indicate

Most students know that their SAT and ACT scores have a big impact on where they can get into college. But what isn’t as well-understood is whether those scores can predict how well a student will actually do once they arrive on campus. Looking at the research shows that there isn’t an easy answer to this question. SAT and ACT scores do have predictive value, especially for first-year grades, but they don’t tell a complete story about a student’s work ethic, support system, or long-term future.

That’s why you should treat test scores as a useful tool, not a final verdict. A strong score can strengthen an application and show readiness for college-level academic work. No score can capture everything that makes a student likely to grow and succeed– but what can these scores tell us?

What the Research Says About Test Scores

The strongest case for SAT and ACT scores comes from studies that compare test results with college grades. A 2024 Opportunity Insights analysis looked at students at Ivy-Plus colleges and found that higher SAT and ACT scores were associated with higher first-year college GPAs, even after accounting for race, gender, family income, and high school grades. In that sample, students with a 1600 SAT or 36 ACT had first-year GPAs about 0.43 points higher than students with a 1200 SAT or 25 ACT.

That finding doesn’t mean a student with a lower score can’t thrive. It means that, across large groups, scores tend to sort students by measurable academic preparation. Admissions offices care because first-year grades can affect retention, major options, scholarships, and whether students feel academically settled.

The same study found that high school GPA was less predictive of first-year college GPA at those highly selective institutions. That’s important in an era of grade inflation. A 4.0 from one high school may not mean the same thing as a 4.0 from another. Standardized tests offer one common, imperfect benchmark.

Why Different Studies Reach Different Answers

Research on test scores can seem confusing because different studies ask different questions. Some look at first-year GPA. Others look at graduation rates, class rank, or long-term outcomes. Some focus on highly selective colleges, while others examine large public university systems. Those choices can change the results.

The University of California’s 2020 SAT and ACT study is a good example. UC researchers found that SAT and ACT scores added predictive value beyond high school GPA alone. In their data, SAT Reading and Math scores accounted for 13 to 21 percent of the variance in freshman GPA, while ACT Composite scores accounted for 14 to 22 percent. High school GPA fell in a similar range.

At the same time, the UC report showed that after controlling for student demographics, high school GPA was stronger than test scores for some outcomes, including first-year retention and four-year graduation. Test scores may be useful for predicting classroom performance, especially early on, but graduation depends on many other forces.

Another study in the Journal of Intelligence, this one from 2023, examined why ACT scores predict academic performance. The researchers expected that general intelligence might explain the relationship. Yet even after they controlled for general intelligence, ACT scores still predicted college grades. This is interesting, because it suggests ACT scores may reflect more than raw reasoning ability. The test may capture skills students use in college, including reading under time pressure, applying math efficiently, and sustaining focus. The researchers tested other possible explanations, including pre-course knowledge, motivation, interest, determination, and self-control, but those factors didn’t fully explain the ACT’s predictive value in their sample.

And as another recent study shows, there are alternate predictors for college performance. “Test Scores, Class Rank and College Performance,” looked at five Texas universities with different levels of selectivity. The researchers found that high school class rank was a strong predictor of college performance and, in many cases, stronger than standardized test scores. They also found that test score advantages didn’t protect every student from academic difficulty in college.

That’s an important reminder. Academic habits over several years can reveal things a single exam can’t. For example, class rank can show how a student performs relative to classmates who had access to the same teachers, grading policies, and courses. For some admissions systems, that local context can be very informative. But ultimately, what these studies show is that standardized tests can reflect several forms of academic readiness at once. Students who improve their scores often improve related skills too, especially timing, accuracy, and strategic problem-solving.

What Test Scores Can’t Predict

SAT and ACT scores can’t predict a student’s entire college experience. They don’t measure whether you’ll find the right major, build healthy study routines, ask for help, manage stress, or recover after a hard semester. Those choices shape college success in ways no admission test can fully capture.

They also can’t predict your future career or sense of purpose. A high score doesn’t guarantee an easy path. A lower score doesn’t block a meaningful one. Students grow at different rates, and college itself changes people.

This is why you shouldn’t let a score become your identity. It’s feedback, not fate. Use it to understand where you are, what needs work, and how you can make your application stronger. Then keep the larger goal in view. College admissions officers know this, too– that’s why test scores work best as part of a larger application. A score can show one kind of readiness. Grades and course rigor show another. Essays, recommendations, activities, and personal context can help colleges understand how a student learns and who they might become.

How Students Should Think About Their Scores

A good SAT or ACT score is best understood as a stepping stone. It can help you become a stronger applicant, earn scholarship consideration, and show colleges that you’re ready for demanding coursework. For students applying to test-required or test-preferred schools, a competitive score can be a real advantage.

Still, your goal shouldn’t be “get a good score” in isolation. Your goal should be to use that score to support the college path you want. That means choosing target schools thoughtfully, keeping your grades strong, and preparing for the work that comes next.

If your current score isn’t where you want it to be, don’t panic. Scores are among the most improvable parts of the college application process. With the right plan, students can learn the format, fix recurring mistakes, build timing discipline, and approach test day with far more confidence.

How To Use Your Standardized Test Scores

So, do SAT and ACT scores predict college success? Yes, but only to a point. They can help predict academic performance, especially first-year grades, and the research shows that they add useful information in many admissions contexts. However, they don’t predict everything, and they certainly don’t define what a student is capable of becoming.

The smartest approach is to take the test seriously without letting it take over. A strong score can help you reach the schools you’re aiming for. Once you get there, your habits, choices, curiosity, and persistence will carry far more weight than any number on a score report.

If you’re ready to strengthen your score and move closer to your college goals, Prep Expert®  is here to help. Our top 1% SAT and ACT tutors know the strategies and techniques you need to get the scores you want. Check out our SAT and ACT course catalogs to find the prep option that fits your timeline.