First of all, this course had 1450 applicants for this year and takes around 7%. It’s one of the most competitive courses and attracts many star studded applicants from abroad, around 50%. The 5 most popular A levels are: Maths, Economics, History, Further Maths and Physics. Therefore I’m not sure Biology is very relevant. History or physics would be better.
On line there is masses of freedom of information data about GCSEs and A levels which must be stellar and they like GCSEs in the right subjects (see Rusbridger article) but don’t say what they are. As so few are even interviewed, let alone get a place, its worth looking at all this data to see what attributes a successful candidate has. TSA scores are important. They may also require marked work submitted from school. In the Rusbridger article it mentions school teacher marking. When DD applies for another subject, this was a marked essay.
Another great piece of information, as mentioned above, was written by Alan Rusbridger about Lady Margaret Hall and the interview and decision process for this course in 2015. The really interesting bit is the disagreements over pooling. There is reference to a lot of debate about red flag students (background and school) and what school a student went to as meaning they know the student is likely to be good over a school they don’t know. That was worrying! The article talks at length about interviews, what students should be able to talk about and even how does your Physics A level relate to this course? Biology might get the same question. It’s hugely important to be up to date with British and world economics for interview too. They like candidates they would like to teach - this is very clear! This is why some people who look good on paper don’t make the final cut. It is certainly not all about results, but likely results and teachers over egging brilliance are taken into account.
The university also provides a hefty reading list and I think that’s why History is a big bonus. Lots of reading and an essay subject. The course is 50 per cent essays. History may well outrank both Biology and Psychology for this particular course. The vast majority of successful candidates think it does. Also lots are offering 4 A levels which suggests Further Maths.
When a course is so competitive, I think ticking as many boxes as you can gives you a chance and even that can be a slim one. It may well be possible to shine at interview, if you can get there, with excellent application of knowledge to their questions and being able to think about credible solutions to the questions they pose. They do like answers to be forthcoming and candidates who think on their feet. Good luck though.