If you are an undergraduate student looking for admission to institutes in the US, you will appear for the SAT or the ACT. the SAT is an undergraduate exam which consists of evidence based reading and writing and math, and the maximum points for this exam is 1600. Certain Universities ask the SAT students to write an essay as well, which has holistic scoring out of 6. If you wish to take the ACT, then you have to prepare for an additional subject i.e. Science.