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53F is pretty cold but I would argue that you should be able to handle that water temp and be able to perform skills in that sort of temp. Sounds like 53F may be more or less normal for your part of the world. So if I am the instructor and I see you struggling in that kind of water, I would also fail you because I will not have complete confidence that if I cert you and you are out there diving in 53F water by yourself you will be able to perform adequately.
I'm impressed! You must be quite a diver!
In normal humans, 53 degrees will give you just a little better than an hour of consciousness, and would then require transport to a hospital and rewarming in the emergency room.
Terry