Hello.
The big difference in CMAT and CAT exam is about acceptability CAT exam is the top entrance examination in India for management course while CMAT comes on 2nd stage, CAT examination is accepted by almost all  Management institute including all IIMs while CMAT exam is accepted by 400 + business schools, second difference is about difficulty level CAT exam is difficult than CMAT exam, it would be easy for you to crack CMAT exam because of less competition and also because of its difficulty level, third differences of question paper format.
Best of luck.

Dear,

The basic difference between the two is All India Council for Technical Education (AICTE) conducts CMAT while IIMs conduct CAT I . IMs, FMS, MDI, IITs, SPJIMR and other top MBA colleges in India do not accept CMAT score. They accept CAT score. CMAT is of low difficulty level exam as compared to CAT exam. CMAT has 25% negative marking while CAT has 33% negative marking for wrong answers. No candidate in CMAT is disqualified and is eligible for shortlisting, however IIMs shortlist the candidates on the basis of minimum qualifying sectional score. CAT has 3 sections, whereas CMAT has 4 sections. Also, the no. of questions varies.

Hope this helps!

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