As per the eligibility to apply for CAT Entrance Exam you should hold a Bachelor’s Degree with minimum 50 percent marks or equivalent CGPA awarded by a recognised university or educational institute.

 You   must fulfil any one of the following conditions in order to be eligible for the exam:

    Bachelor’s Degree with requisite percentage of marks Or

    Professional Degree with requisite percentage of marks Or

    In the final year of Bachelor’s Degree with requisite marks percentage

You can check the eligibility of the exam with the given below link.

https://bschool.careers360.com/articles/cat-eligibility-criteria

In case you have any other query then let me know.

Good Luck!