Ability/ Achievement tests are used to evaluate a student's or worker's understanding, comprehension, knowledge and/or capability in a particular area.
The test of General Educational Development (GED) and Test Assessing Secondary Completion TASC evaluate whether a person who has not received a high school diploma has academic skills at the level of a high school graduate.
Private tests are tests created by private institutions for various purposes, such as progress monitoring in K-12 classrooms.
Admissions tests are used in the admission process at elite or private elementary and secondary schools, as well as most colleges and universities.
They are generally used to predict the likelihood of a student's success in an academic setting.