Help with subject choices

Hi I am Currently in year 12 doing my ASs. My subjects are biology chemistry geography and BTEC ICT. However I really dislike geography and would like to drop it either now or at the end of the AS year.. Would 2 A levels and a BTEC be enough to get into a uni to study courses like medicine biology (most medical and chemical courses eg optometry/dentistry) or computing as long as I get good grades.

If you mean Medicine as in going on to become a doctor then absolutely not BTEC's aren't accepted as they aren't considered academic enough. Same with dentistry.
For other sciencey courses such as medicinal biology(perhaps what you meant) a Btec and 2 alevels would probably only be sufficient at lesser universities.
Although i see where you're coming from having done geog to a2 myself i'd recommend sticking it out. It isn't the most riveting subject but it isn't the most challenging either. It is a subject people generally do very well in.
It depends if you can look past the next 2 years. If keeping geography is a token to doing what you want in the future you need to think really carefully about it as that BTEC could hold you back.

I see what you mean but wont it only be useful if i get a good grade in it? so far im not doing very well as i find the structure of the questions difficult to answer

Well yes and no. If you want to go to top unis to do sciences many won't accept a BTEC hence it is utterly useless. You need to narrow down what you'd like to do and then speak to relevant faculty and look at relevant uni websites as to whether they'd take that BTEC as it's hard to say without knowing more precisely where you're aiming.

Don't forget that huge numbers of people go to their first choice of uni but miss the grades. You've only been doing geography a level 1 term so take time to let it come together and work on things like question style. Out of interest what board is it? Don't discount geography so early on as you may need it, you don't want to be in a position on AS results day where you don't do well in one of the subjects you want to continue but have already discounted geography.