GNM
yes the signature of college principal or director is required on you application form. without this you will not be abel to allowed to sit in examination hall. so kindly have sign if not. all the best.
Hi Rituraj.
With a rank of 3500 under SC category, chances for you to get into an NIT is pretty good. You'll surely get admission in you homestate NIT under HS quota. You can chack that using the college predictor or JoSAA website.
https://engineering.careers360.com/jee-main-college-predictor
https://josaa.nic.in/result/result/openingclosingrank.aspx
Good Luck.
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