Hello

For admission to top B-schools, you will have to appear for entrance exams like CAT, XAT, SNAP, MAT, NMAT, IBSAT, etc.
CAT and XAT are difficult exams as compared to other exams such as SNAP, IBSAT, etc. It is advisable to appear and qualify the entrance exams and get admission in any decent college with good placement records.

Good Luck!