He did 3 A levels in 2010 and then changed his mind about what he wanted to do at university. He eventually decided he wanted to study Pharmacology and joined a course aimed at resitters to do a 1 year A level in Chemistry. This was very intensive and he did extremely well and got an 'A'.
However, when he comes to fill in his results for UCAS application 2012 there is nothing to differentiate between this being a retake after doing badly in it first time.
He will make sure this comes out in his personal statement, but if admissions people just scan the results it could be that he flunked it first time round.
The reason he is concerned is that chemistry is the most important of the a levels for this course. I wondered if anyone (admissions tutors?) could shed some light on this.