Hello!
The SAT is an exam that tests your knowledge on core courses. Colleges often consider your SAT score when accepting new students.
If you do well on the SAT exam, you have a higher chance of being recognized and accepted into colleges than if you do poorly. However, if you do not do as well as you can, you can retake the SAT for a chance at a better score.
I hope this helps you! Have a great day!