what is the minimum & maximum rank must i get to do b.tech in mechanical/aerospace/civil in iit chennai/karagpur/delhi/kanpur/guwahati/bombay/roorkee

Hi,

You can check the link given below for the previous year cut-off's for IIT JEE Colleges

http://www.askiitians.com/iit-jee-2009-rank.aspx
 
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Regards,
Askiitians Expert
Amit - IT BHU