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Secondary teaching subject options with a criminology degree?

Hello, I'm currently an undergrad studying criminology and criminal justice. I am hoping to go into teaching at secondary. I have A-Levels in Biology and Sociology.
I am interested in teaching biology or geography. I have no former qualifications in geography. I am wondering if I would be able to get onto a PGCE with QTS course in secondary geography if I completed an A-level in geography from home before applying. Or if I decided to do biology, would my A-level in biology be enough? I'd be happy to do a SKE course too. Does anyone have any experience of going into teacher training with just an A-level in their chosen subject?
Would I be eligible for the 20k/25k bursary for biology/geography?
Thanks.