GCSE requirements are "hard" requirements - if you don't meet them you will be automatically rejected.
Equally unless you actually want to be a pharmacist you shouldn't be aiming to do a pharmacy degree. It's designed for that one purpose really.
Chemistry has as good employment opportunities as any other degree. Most graduates go into roles unrelated to their degree and most graduate employers don't care what degree you studied. The world isn't school, nobody really cares what you studied in the end unless they require specialist knowledge (e.g. a role doing advanced mathematical modelling of something would require requisite numerate skills) or a specifically accredited degree (e.g. more healthcare professions, many engineering roles, professional psychology roles etc).