My dad used to tell me you need to hit 9 out of 10 in a pie plate (10-ish inches) from a given range during practice to consider yourself effective at that range in the field. I think that's a pretty good standard for basic proficiency at shorter ranges, but I feel like that should shrink down to 5-6" past 35 yards since your margin of error is smaller the longer the arrow is in flight.
And to be clear, these standards assume you're shooting broadheads during practice, not field points. Lots of fellas out there who can shoot a softball group at 40 yards with field points, but when they screw on their big fixed blade heads, that opens up to a 12"+ group because their bow (or arrow) isn't tuned to perfection.