Many colleges review students' scores on the or before deciding whether to offer them admission

ACT; SAT is the anwser you are looking for

The answers would be: ACT and SAT.

Many colleges review students' scores on the ACT or SAT before deciding whether to offer them admission

The ACT college readiness assessment is a standardized test for high school achievement and college admissions in the United States produced by ACT, a nonprofit of the same name. 

The SAT is one of two admissions tests (the ACT being the other), often required for admission to US universities. The SAT Reasoning Test is a three hour and forty-five minute test comprised of three sections: Critical Reading, Math, and Writing. The testis designed to measure critical thinking and analytical skills.