Doing Government and Politics AS and A2 in one year.

I've just finished my AS exams (Biology, History, Geography, ICT) and am thinking about what to take and drop next year. I am not hugely optimistic about doing well in Biology and I don't want to take ICT to A2. I've been offered the choice of doing the Government and Politics in one year. The subject interests me (when applying to college it was a debate between doing Biology or Government and Politics) but I am concerned with the workload, particularly now that the January exams have been taken out.
Do you think I could feasibly do Government and Politics in one year? I feel that the humanities subjects are my strong point and while I enjoy Biology, I don't feel that I will do well.