There is a lot of biology and statistics - although most unis teach the stats with the help of a computer programme (SPSS being the most common, I think), and as a result of that it's more about learning to use that rather than actually understanding the statistic tests, so you don't have to be any good at maths.
I got a 2.1 and had to work hard, although I'm fairly confident I could have got a first if I hadn't been so lazy at various points during the three years.