There are a few important differences between the PSAT and the SAT. The PSAT is the shorter test, completed in 2 hours and 45 minutes. The SAT is completed in 3 hours. The scoring scales differ slightly between both tests, with the PSAT maximum score at 1520 and the SAT maximum score at 1600. Scores from the SAT will be evaluated for college admissions. PSAT scores do not directly influence admission decisions; however, a high enough PSAT score can qualify a student for National Merit Scholarships.