The admissions team wants to admit a diverse set of students. There is no preferential treatment to engineers. Don't assume that admissions decisions are made in a fixed percentage or quota. Each application is looked at individually.
But I can tell you what profile of graduates has gotten into HRM from the past three years alone. Here's a list of the most popular degree programs of people who got into HRM.
Pharmacy graduates | BBA, BBS Chartered accountants |
Psychology graduates | Medicine, and dental graduates |
Graduates from basic science like Physics, Chemistry and Maths | Literature and language graduates |
Social Sciences graduates | Graduates in Communication |
Even if you have a different profile that is not mentioned in the above-mentioned list, it does not matter. The fact that these people from so many different backgrounds got into XLRI, states the fact that the program is open to all. So, concentrate on doing well in XAT, and the rest should fall into place.