should i attempt CAT MAT GMAT etc all at once to be eligible or should i attempt anyone of them to be eligible?

You need to have scores of any one of them to be eligible for admission. Selection: The candidates are selected on the basis of a three stage selection process. Stage 1 : Candidate qualified in CMAT / CAT / MAT / ATMA / XAT / SNAP & Other National Level Entrance test with a score of 50% and above.