should i go for medicine?

So- at the moment im doing A levels in - Biology, chemistry, and Art

Over the past year i was deliberating doing medicine, i wasn't sure as at the time i wanted more to peruse art and design. I faffed around in my science subjects as i was working harder at my art. but after the summer i decided i wanted to do sciences, towards medicine. So i have applied to biology. I wanted to do biology to possibly do post grad medicine I have 4 offers so far (waiting on Bristol). But although my As grades were not incredible ABBBC (high B's in bio and chem)my teachers are now telling me that i can get A*AA if i keep up my autumn term rate of work (i have been working so much harder this year). Now i want to do medicine straight from college, i know i can deal with the commitment now.

Is it worth dropping my offers in august if i get three A's? and applying again? ( i am prepared to do work experience and ukcat in the summer)or would doing it postgrad be better?

My advice to you would be not to do medicine just because you can. I made that mistake. If you feel you genuinely understand what a career in medicine/ what a medical degree entails and feel like it is something you are 100% sure that you'd like to do then go for it otherwise do something which you are genuinely passionate about.