I'm still waiting for their call of approval or rejection letter.
I think if the reason you failed could be rectified, I think it's okay to try again. If you're not sure of the reason and did not do anything after the check up, then it's pointless. Just my thought.
How about you go for a full check up at a hospital? The doctor will be able to tell you whatever it is that's wrong and then you could rectify it. At least after that, when you go again for the interview, you know you're fine.
Just my thoughts. Good luck whatever your decision may be.
