HI PRIYANKA,

As per previous years cutoffs and the ranks ,for OBC-NCL candidate to get into an IIT irrespective of His/her stream has to rank less than 5k.

As per previous year, to be precise the last rank admitted to an IIT was in IIT ROORKEE whose rank was 4381.

So it would be rather safe for you to rank less than 4k to have a fair chance to get into an IIT irrespective of stream choice.

If you need a particular choiced stream in the iit then i would suggest you to try to rank below 2k atleast to get preffered stream in ANY IIT.

For Detailed information about last year cutoffs etc for Advanced visit-https://www.entrancecorner.com/engineering/jee-advanced-2017-cutoff/

BEST OF LUCK FOR JEE ADVANCED!!!