Can I get admission in BMSCE for CS branch?

Congrats,its a pretty decent rank. If you are in general category its a little difficult but you can try for IS too.

It is almost not impossible to get into CS branch as the cut-offs will be in 3 digits.

If you are in general category then getting CS is not possible. If you belong to OBC or have any reservation then is mostly probably based on the cut-off rank of that particular category.