The two college entrance exams in the US are the SAT and the ACT. Colleges weigh the two tests equally, so you can take either. The SAT is generally easier in the math section and has a harder english/ reading section, while the ACT has an easier english/ reading section and a harder math section. So basically, take the ACT if you are good at math and science, and take the SAT if you are good at reading. Hope this helps :)
