Hello Parichay,

It has not been released officially till the time. It will be released soon.Even if you are not among those who are able to score 75% aggregate marks in class 12 th examination, you still have the admission opportunity based on top 20 percentile of class 12 th board. 

I can give you a link of careers360 where top 20 oercentile of 2018 , 2017 , 2016 have been provided.

https://www.google.com/amp/s/engineering.careers360.com/articles/top-20-percentile-cutoff-of-class-12-boards-for-iit-admission/amp

Good luck.