HI,

CAT - Common Admission Test by IIM

MAT - Management Aptitude Test by AIMA

CMAT - Common Management Admission Test by AICTE

GMAT-The Graduate Management Admission Test by GMAC (Graduate Management Admission Council)

All four exams are the entrance exams that act as the medium for the admissions to the top MBA colleges of the country.

Their conducting bodies are different, they have their different accepting colleges.

MBA Admissions to top colleges across India requires the scores of CAT/MAT/CMAT/GMAT also there are many other entrance exams like XAT/NMAT/KMAT etc.

Applicants have to apply differently to all of these exams.

Participating colleges of the given three exams are different, some institutes accepts the scores off any one of the following and some institutes require only specific entrance test.

CAT Exam is the most competitive exam for the admissions to the PGDM/MBA/PGPM courses after the graduation. Top most colleges of India like IIM Bangalore, IIM Ahmedabad, IIM Lucknow, IIM Calcutta and many more. 

MAT Exam is conducted four times in a year in the months of February, May, September and December. It is an online test with its scores valid for 1 year. 

CMAT Exam is conducted by for the admissions to those colleges who is approved by the Ministry of Human Resource and Development.ONCE IN A YEAR

The syllabus of CAT and GMAT are almost the same. However, the difficulty of the Quant section of GMAT is far lesser than that of CAT exam.GMAT can be taken up to five times over a period of 12 months, with each test being atleast 16 days apart.

For more information check the links below

https://bschool.careers360.com/articles/top-mba-entrance-exams-you-must-take

https://bschool.careers360.com/exams

GOOD LUCK