According to the latest jee main and advance 2019 criteria you need to have a minimum of 75% aggregate in your 12th board exams (if from general category) and 65%( for SC/ST) and you will not be able to get admission im any of the IIT or NIT if you failed to fulfil this criteria, irrespective of your performance in the entrance exam.
The best alternative you have, is to either go for any other college expect IIT or NITs or you can apply for improvement exams in order to alter your results again.
Thank you. 

HELLO!PRITHVIRAJ

To participate in counselling process for taking admission in IITs you must need 75% in boards or to be in top 20 percentile of state boards marks.If you get qualified in advance with marks and your boards percentage less than 75 then you are not elligible for taking participate in counselling for seat allotment.

You can ask if you have any other queries.

GOOD LUCK!

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