If one wished to predict an individual's ability or potential for success in a given area, one would use an test. If one wished to measure an individual's level of knowledge in a given area, one would use an test

Aptitude

Achievement

Explanation:

In psychology, an aptitude test is a test that is used to predict one's potential for success in a given area or the learning capacity that someone has when it comes to learning new skills.

On the other hand, an achievement test is a test that is used to measure the level of knowledge one person has in a given area of knowledge or expertise.

Thus, if one wished to predict an individual's ability or potential for success in a given area, one would use an aptitude test. If one wished to measure an individual's level of knowledge in a given area, one would use an achievement test

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