SAT
SAT - required of all high school graduates in the US
SAT I: general exam (analytical, verbal)
SAT II: specialized subject (Physics, Biology, foreign languages, etc)
To register online or to learn more about this exam, visit the SAT website at http://www.collegeboard.com/
GRE
GRE - required for entrance to most US universities. Scores are valid for five years after the date of testing.
To register online, please visit the GRE website at http://www.gre.org/