The rank range will be around 65,000 All India Rank and equivalent marks range will be around 410 marks to avail JB Roy Ayurvedic Institute Kolkata. But this year the cutoffs might rise as even you might be knowing that the number of candidates had increased and also the paper level was called easy comparatively. So this year the marks might go around 420/425 and above. 

Best wishes to you. Thank you.