biosciences at kcl

why do the bioscience degrees at KCL, have such high entry requirements AAA, I would expect it to be AAB-ABB. Most uni have AAA for medicine and dentistry. Also at KCl degrees like pharmacy have AAB, but biosciences are AAA. I would need to do a bioscience degree in order to do graduate dentistry, so I'm in a bit of a pickle as my predicted is AAB, and don't have contextual offers.

you don't need to do it at KCL though, there are plenty of other uni's with lower grade requirements