Is it true that the students who have done BBS+MCA don't get good placements as compared to the students of BCA+ MCA?

Dear Sumit Sharma, Ultimately, your subject knowledge and domain expertise are the most important factors in cracking a job. Don't keep such negative things in mind, just start looking for jobs instead. All the best.

The score and the college are the main things.

Doing a course alone will not make you employable. Prospects also depend on the person who holds the degree.

No, it all depends on us that how much we know about IT field and interest, but it also depends on MCA university. You should go for a good university to get better education.