Is there NRI reservation or any preference for seats in any IIT?

Hi Student,

There are no NRI quotas as such.
you can always visit jee.iitd.ac.in for details. Also refer to the attachments for deadlines.
The reservation put forward by the Indian government are as follows:

SC candidates - 15% seats
ST candidates - 7.5% seats
OBC candidates - 27% seats
leprosy-cured candidates - 3%

Foreign nationals [Foreign passport holder or have either Person of Indian Origin (PIO) or Overseas Citizen of India (OCI) interested in pursuing their undergraduate studies at IITs i.e. B.Tech. and Dual Degree have to appear Paper-1 of JEE (Main) conducted by CBSE. Only top 1,50,000 candidates (including all categories) who qualify in Paper-1 of JEE (Main)-2013 will be eligible to appear for JEE (Advanced)-2013. Admission to IITs will be based only on category wise All India Rank (AIR) in JEE (Advanced)-2013, subject to the condition that such candidates are in the top 20 percentile ofsuccessfulcandidates of their Boards in respective categories.

Foreign nationals interested in pursuing their undergraduate studies at IIT Madras for 5 years integrated M.A programme have to write Humanties and Social Sciences Entrance Examination conducted by IIT Madras. The qualified foreign nationals will be given seat on supernumerary basis.

This is the statement maintained by IIT Madras and shall be the statement in context of the NRI reservation policy/ admission policy to other IITs as the decision is taken jointly by all the IIT’s senate.
So, you’ll have to appear for JEE to get admission to IIT’s.