beyond/within the realms of possibility

beyond the realm(s) of possibility

Impossible. With my low test grades, I think that getting an A in this class is beyond the realms of possibility.
See also: beyond, of, possibility

within the realm(s) of possibility

Possible; capable of happening. You worked so hard this semester that I think an A is within the realm of possibility.
See also: of, possibility, within

beyond/within the realms of possiˈbility

impossible/possible: A successful outcome is not beyond the realms of possibility.