Hello,
You have not mentioned your category any where. Your category plays a very crucial role in your admission . Anyway you have secured a very decent rank .With this rank you have good chances of getting admission in the main campus. Previous year last merit ranks admitted for ma economics in banaras hindu university for various categories were.

• General

596

• OBC

190

• SC

173

• ST

73

• BHU General

138

• BHU SC

35

• BHU ST

10

• BHU OBC

114
Councelling process has already begun. Make sure that you keep yourself updated.
For further details browse the link given below.
http://www.google.com/amp/s/university.careers360.com/articles/bhu-pet-cut-off/amp
Hope this helps
Good luck