Dear Sowmya,

First of all, there is no such branch called IS there is Branch called IT( Information Technology). So I will be answering your question assuming it IT not IS.

If you are from Jharkhand and your CRL rank is 16000 you will easily get a seat in BIT Mesra not for  CSE but definitely for  IT both but you have to wait till 7th Round. According to last year, JOSSA Opening and Closing Rank those who got 12840 Rank in JEE Mains easily got admission in CSE and those who got up to 19481 Rank got admission in IT easily. But every year closing rank increases so there is a fair chance that you will get a seat in CSE. But If you are from another state you will not get a seat in CSE nor IT. As minimum rank to get admission in CSE and IT for other states candidates are 10390 and 11905 respectively.

Best of Luck.