Most Universities in the US are test optional. However, there are a few exceptions. Certain universities may be test-optional or test-blind/test-free. For Ivy league colleges, unless the student applies through a sports quota or is from an underrepresented community, SAT scores are being considered. For Ivy-like colleges like Duke, Northwestern, Tufts, etc, the SAT is not being considered.
Under a test-optional policy, colleges still welcome test scores from students who choose to submit them and consider them a valuable data point and part of the review process if testing is available. At the same time, they are confident in reviewing a file without a test score and still rendering a fair decision—in other words, students without scores are not disadvantaged.
Test-blind or test-free
If a school is test-free, it means they will not consider standardized testing in their application review. Even if you have a 36 on the ACT, or a 1600 on the SAT, and you send it to them, they will not consider it as a part of your file.
Some Universities that are NOT test optional and requires SAT scores are:
Auburn University (for students with below a 3.6 GPA)
Florida A&M University
Florida Atlantic University
Florida Gulf Coast University
Florida International University
Florida Polytechnic University
Florida State University
Georgetown University (requires full testing history)
Massachusetts Institute of Technology
New College of Florida
University of Central Florida
University of Florida
University of Georgia
University of North Florida
University of South Florida
University of Tennessee
University of West Florida
West Point (students may submit PSAT in lieu of ACT or SAT)