Career

Broadly speaking, there is not much difference between the curriculum of a B. Com and a BBA degree, in the Indian context.
It is more of a marketing gimmick to create an illusion of superiority around BBA to make students, and hence of course their parents, pay more for their studies.
Let's take a look at the subjects, one studies in B.Com vis-a-vis BBA. I cannot really mention all the subjects of both the courses here because that will make the post too long. But here are two links that talk about the subjects taught in the two courses, and you will not find major differences between the two.
Bachelor of Business Administration
Bachelor of Commerce.
CAT, the most popular of these tests has three sections:
Quantitative Aptitude (QA)
Data Interpretation and Logical Reasoning (DILR)
Verbal and Reading Comprehension (VRC)
Sadly, XAT and other tests have a similar pattern. They test your ability to solve questions of mathematics, reasoning & logic, and English. Your degree comes into picture at a later stage i.e. only after clearing the preliminary entrance test.