The name of BHU is itself enough to describe status, there is no need of rating.
Howere I couldnt get opportunity to study there, I tried two times to take admission in M.Sc. Chemistry here but my bad luck couldnt get so.
Some of my friends study here, one of them is a research student of Physics from IIT BHU and one of them completed his Bachelor of Science from there.
So, I got information from them only and they told there are national level faculty and arrangement to study.
And very good placement for professional courses.