Hello Sparsh ,
First of all congratulations for clearing JEE Main .With a rank of 67789 in obc category ,the chances of you getting any NIT in JoSSA counseling is good but there is a good chance that you will not be able to get a NIT in the initial rounds. Fill your preferances wisely and research about branches as well.
Hope it helps and all the best for your future endeavors .

Hi Sparsh,

Visit the following link, to know the trends of opening and closing ranks based on rank in CRL. Here you will get all the cutoffs of NITs and IIITs considering all quotas.

https://d2cyt36b7wnvt9.cloudfront.net/exams/wp-content/uploads/2018/04/02163617/nit-cutoff-2018-r2.pdf

And also you can visit the link to know the chances of getting NITs based on your rank category wise.

https://engineering.careers360.com/articles/jee-main-cutoff

It will be great if you can use college predictor tool, as it will directly give you the colleges -

https://engineering.careers360.com/jee-main-college-predictor

Hope this helps.