Hello,

Chance are good for you and you can get almost every branch except CSE,IT,ECE in NITs(except top 10),like NIT Srinagar,Agartala,Mizoram,Nagaland etc.

You can use our college predictor tool to get the idea about the same:

Hello aspirant

With 84 percentile and being OBC category. Your sister's OBC category rank will be around 2500-2700.

She has scored quite good score. She will definitely get seat in NIT. She can apply in

NIT KANPUR

NIT SURATHKAL

NIT DELHI

NIT KANPUR

WHich branch it college she get depends upon cut off of the college which depends upon number of candidates appeared and qualified in exam, difficulty level of exam and previous year's cut off.

For college prediction following link may help you

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