Here is the link to the TSR stalking thread for last year
www.thestudentroom.co.uk/wiki/Medicine_Applicants_Stalking_Page_2011_Entry
it gives BMAT results for all those recorded as well as whether they received an offer.
The BMAT is used as a cut off for interview. Different medical schools use different cutoffs.
The PS is scored by some medical schools.
The interview format varies.
Some people come across well at interview and have clearly grasped concepts of team working, ethics, detailed knowledge of uptodate genetics/science, enthusiasm, curiosity and empathy and commitment.
Others can only drone on about the very many types of work experience and their leadership skills as demonstrated by their extracurrics and prefectship.
Extracurrics; useful to show coping with stress/work life balance/team working/ability to cope with challenges therefore choose those to mention which can be relevant to working in a DGH in the sticks far away from home.
There is an element of fate/innate ability to communicate about the whole thing so take a step back.
But make sure he knows at least one relevant scientific concept in dazzling detail.