Is a BCA or B.Sc. Data Science degree exempt from the dMAT requirement?

Yes, in most cases. APS India's official field list explicitly states that standalone Computer Science, BCA, Data Science, Artificial Intelligence/ML, and Cyber Security degrees are not automatically covered, unless your official degree title is separately classified as Engineering by APS India based on your academic documents.

The mistake that trips students up

The single biggest mistake students make here is judging their eligibility by what a consultant or college brochure calls their course, rather than the official degree title printed on the marksheet. A "B.Tech. in Computer Science and Business Systems" and a "B.Sc. in Computer Science" can look similar on a resume but land on opposite sides of the dMAT requirement.

What to do before assuming you are covered

Because the classification rests on the exact wording of your degree, a similar-sounding title is not enough to go on. If there is any ambiguity, confirm your status with APS India in writing before you act.

My Advice

If you are a BCA or Data Science graduate, do not register for dMAT "just to be safe." Get written confirmation from APS India first; the fee is not reversible once the deregistration window closes, and registering for a test you do not need wastes both money and time you could spend on your SOP.