So many people last year got into the RVC (particularly) without getting their grades - ie getting AAB or even ABB with an AAA offer - which is nice to know!!
As for chemistry being important - theres little bits and pieces everywhere - where you think - oh yeah I remember that! - hypothetically you could live without chemistry really in the 1st year - but I think it will be more important once you really get into vet side of things - in later years i guess.