For Undergraduate Studies:

Standardized Tests:

• SAT (Scholastic Assessment Test) or ACT (American College Testing): These are required for most undergraduate programs in the United States.

• International Baccalaureate (IB) Diploma: This is a rigorous two-year program that can be considered in place of SAT/ACT by some universities worldwide.
  
  
  

For Postgraduate Studies:

GRE (Graduate Record Examinations): This is a general test widely accepted for Master's programs in various disciplines across the US. Some universities might also require GRE subject tests specific to your field.

GMAT (Graduate Management Admission Test): This is required for admission to Master's programs in Business Administration (MBA) or related fields at many universities worldwide.

Other exams: Specific professional programs like Medicine (MCAT), Law (LSAT), etc., might have their own entrance exams.

Language Proficiency Tests:

TOEFL (Test of English as a Foreign Language) : These are mandatory for most universities abroad where English is the primary language of instruction.

https://www.careers360.com/exams/gmat

I hope it helps !