I got 120 in jee mains 2019 april 9th first shift,will I get admission into any of the nit's 0r IIIt or cfti under OBC category???

Hey,
You can atleast get NIT with this score although there is no confirmation about the branch with this score. For previous year cutoffs you can refer the following link. But coming to IIIT its very difficult to get good IIIT.

https://www.google.com/amp/s/engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches

Hope this solves your query.

Good Luck!!