An achievement test is designed to measure a person's level of skill, accomplishment, or knowledge in a specific area.
Achievement tests are not used to determine what you are capable of; they are designed to evaluate what you know and your level of skill at the given moment.Achievement tests differ in important ways from aptitude tests. An aptitude test is designed your potential for success in a certain area. For example, a student might take an aptitude test to help determine which types of career they might be best suited for. An achievement test, on the other hand, would be designed to determine what a student already knows about a specific subject.