Art GCSEs during college Watch
If you really want to do art you don't really have to have done GCSE art . You can still enter a level art / level 3 and and design without it . When you apply you just need to show some artwork (portfoli of work ) so they can access if you have the art stills do do the course.
Although it's not ideal to have not done GCSE art as you won't have learned the skills but is still possible to learn them . You can easily practice during the summer holidays after GCSE .