Help Pleasee. - A-level Choices.

Hi people.
before i go on, this is just a 'clarification' of my a-levels, and thanks for dropping by :p:

anyways, i was at an interview for a sixth form last week, i told the interviewe my initial choices, then my change of subject.
my initial choices were:
History
English Lit.
Economics
Sociology

i wanted to change sociology to Biology.
(mainly because it's another 'traditional' subject i like)

he looked at me as if to say... 'wat :eyeball:

'
more or less pleading i should stick with sociology and that choosing biology would make your choices 'unusual'.
quote: 'all your chosen subjects are art-based, and you have a science thrown in ... an A in sociology is better than a B in biology etc'
however, i was defiant and stuck to my guns.
was he right?
should i have stayed with my inital choices?
thanks.

p.s. how hard is biology on the AQA board? thanks again