Hi Bhuwan Jha.

For getting admisison in BCE, you have to attempt BCECE and get a good rank. After that, you have to give your options for counselling. And, during couselling, if you can get BCE according to the availability of seat. As you have a high rank, you'll surely get admission at BCE.

As you have cleared the exam, you have to attend the couselling. The two stages in admission are -

BCECE

Counselling