i can't speak for everyone, but mine isn't a concentration problem. when i was in college, i would ofted study in the student commons, which was as noisy as it got ((i'll never forget "yellow submarine" which was blairing constantly - yes, children, i am a child of the 60s).
my wife also says that i am like a dog with a bone when i get into something.
each person is diffenent. it could also be argued that my concentration is a "manic" phase. what do i know? i'm just trying to get through this thing.
take care. and keep us posted on progress.