Hello Vivek, RBI Grade B exam happens in 2 Phase (Phase I & II). To prepare for RBI B grade exam, you need to Know proper syllabus, Go through last 10yrs previous question paper, Solve as many as mock paper. In interview language is not a barrier but be confident and don't get panic 

Kindly go to the LINK to get full detail about the exam...

https://www.adda247.com/rbi-grade-b.html

All the best