More threads like this and I might just go for BJCP status. I think my palte is not up to speed, but I am getting better. I really have trouble with not wanting to make a mistake and not detecting the proper causes to an effect, but it sounds like you don't have to have a remedy, just because the beer has a detectable flaw?
well, you do need to be able to provide feedback to address faults if you want a good score, and (forgetting the whole exam thing for the moment) if you want to be helpful to the brewer.
for everyone, remember Feedback includes not just fixing "off" characters, but what style it might better fit into, and how it differs from the style it is entered into.
"This style has a richer, heavily-balanced-to-malt profile than is present in your beer, or is covered by the high level of sharp, astringent hop characters and what appears to be a wild yeast infection." - that offers some explanation. "DMS - uncover your boil" - doesn't really help anyone.