I think NITs does not permit candidate under 60% in engg. How ever IISC, IITK, IITM, ISM Dhanbad Permit candidate with less than 60% aggregate in engg. If someone has 60%+ in FINAL YEAR of engg they are eligible for IIT Bombay! Other institutes permit less than 60% are IIITH,NSIT,DTU* :D