Off a grade/ Appealing

So I’m 60% sure I got a C in art. I need ABB to go to KCL to study history (contextual). I am very nervous and losing hope. Do you think KCL will spare me since art has nothing to do with history ?? Has anyone experienced this??? Being let off by a grade on a contextual offer ? From KCL or anywhere ?? Pelase I’m so desperate and want to die. Furthermore if I appeal my grade, and it does move up , will my universities be notified and automatically let me in ? How does it work ?

(If anyone did aqa a level art please mention so because I basically received an estimation of my mark and it is off a B by a couple marks based on previous grade boundaries and I have questions !)