Where could these a levels get me

If i took: geogaphy, biology, physics and food tec

The first three you have listed are very respectable, facilitating subjects. However, I think food technology may be a subject that regarded as 'less rigorous'. With those A-levels you have listed, you could pursue quite a large range of degrees at university with law and sciences being open to you. Those A-level wouldn't allow you to pursue a degree in medicine, though or dentistry (if you're interested in those areas) as these courses require chemistry at A-level.

Overall, if you enjoy those subjects you have a pretty solid range. The only weak subject, like I mentioned above, would be food technology (unless you're hoping to pursue a career in food science for example).