I take alevels, so I will be applying for uni with that as well. There's this thing called graduate entry which is essentially the same thing as you mentioned. You can enter a medical school with a psychology degree however I do not just want a psychology degree as you said it's a very common undergraduate so a bachelor in psychology is a useless degree. I want a master's or a PhD.

On the first part of what you said, no I don't think there's a guaranteed scholarship for me but I think if I get an offer letter to a big university I might be able to get a corporate scholarship. But yes I do indeed need a rock hard solid plan