Which branch will i get of chances in get into in.wether any chances on ECE branch.

See you will most probably get in last rounds of the counseling and branches like metallurgy, biotechnology, engineering physics etc ece is slightly is tough...

Petroleum engineering

Yes if the nit has it then you can but most of the nits don't have it and if you're interested in petroleum engineering specially then I can tell you a leading college  upes Dehradhun which is famous for petroleum engineering in India and has great Placement statistics for the Petroleum branch in Arab countries so if you wanna do petroleum you can opt it

I am really confused with my decision to get college with my rank which nit can i get in petroleum engineering or automobiles engineering.plz guide me .my interest is in automobile ECE and petroleum engineering what to do where to go.plz plz guide me according to my rank and which branch i can get easily plz help me