Since you have scored 87 percentile in the JEE Mains,for now your rank is around 12545 but your actual rank will be calculated only after the April,because NTA takes the best of two percentile.Based on your present ranking (since you are in the reserved category),you can might get into NIT Warangal.

At the end everything depends on the cutoff,that changes every year.

You can also go through the article in the link given below:

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

Free free to ask in case of any doubts.