'Achievement' means what you have done. 'Aptitude' means what you can do (but haven't done yet). These tests aim to measure these.
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The ACT is an achievement test, while the SAT is more of an aptitude test. I hope this is the information you need and it also helps me to understand both terms.
Preliminary Scholastic Aptitude Test. The SAT part was shortened from Scholastic Aptitude test in 1993.
You are scheduled to take an aptitude test later today.
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