I will suggest 4 yr first....if u are satisfied then well and good....if u feel u need to know about 5 yr courses then let me know.....i ll answer that too......
For ur rank,,,,the courses advisable are -
Meta in IIT Bombay
Branch of ur choice in IIT Guwahati expect maybe CSE...if u are lucky u may get it.....
Meta in IIT Kanpur
Aerospace, Civil, Chemical, in IIT Kgp
Civil in IIT Madras
Chem & Civil in IIT Roorkee