hello aspirant,

Each year the cutoff changes due to many factors like total students appearing for exam,difficulty level etc.but based on previous year analysis we can predict the cutoff.what do you mean by are you eligible for obc category?if you belong  to any obc category from ap then yes you are from obc category and you need to have a certificate for it.NIT trichy is one of the top NITS in India so you need a really good percentile to fetch seat there especially for cse as cse has more cutoff.for fetching a seat there you need the last year cutoff by rank for OBC  category is 387 and 1060 . which means you need to have percentile around 99.6+.for more info check: https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-trichy

also note that each year cutoff changes  so are your chances into colleges.

hope this helps,

thankyou.