SAT : The SAT also known as Scholastic Aptitude Test and Scholastic Assessment Test is
for those students who apply for bachlor degrees in the U.S.

GMAT : Graduate Management Admission Test ( GMAT ) is a computer adaptive standardized test in Mathematics and the English language for business studies.

GRE : Graduate Record Examination or GRE is very helpfull if you want admission in graduate schools specially in the United States, but all other English speaking countries also prefered it.

LSAT : LAw School Admission Test as name shows its for all the student that are intrested in
LAw School Admission , test is conducted by Law School Admission Council (LSAC).

MCAT : (Medical College Admission Test) If you want make carrier in medical in the United States and Canada then MCAT for you.It is designed to assess problem solving, critical thinking, written analysis, and writing skills in addition to knowledge of scientific concepts and principles.

TOEFL / ETS : The Test of English as a Foreign Language ( TOEFL ) evaluates the potential success of an individual to use and understand academic English at a college level.
The TOEFL test is a registered trademark of Educational Testing Service (ETS) and is administered worldwide.

CAT
The Common Admission Test (CAT) is an all-India test conducted by the Indian Institutes of Management (IIMs)
The CAT is the first step for admission to the IIMs. After the test, by the second week of January next year, the IIMs declare exam scores and put up a list of candidates who are eligible for the next stage of a group discussion and an individual interview.

XLR Admission Test If you want make careeir in Xavier Labour Relations Institute's business school in Jamshedpur then XLR is must