Hi

Congratulations for your result. But unfortunately your 12th Board percentage is low. You have to secure a minimum of 75% aggregate marks (for General category) and 65% marks (for OBC/SC/ST/PwD category) in the Higher Secondary Examination of their respective Boards to be eligible to take admission in IIEST Shibpur or any NITs. 

Check this link to see which colleges you can get through your JEE Mains rank:https://engineering.careers360.com/articles/jee-main-participating-institutes .

Further, individually check the eligibility criteria for various colleges mentioned in the link. You can check using the Careers360 search tool. 

Best of Luck.

Hope this helps.

Cheers!