I find it worrying that you're absorbed in how difficult your A-Level options are, to be honest, it appears as though you've taken them to look good, knowing that they have a reputation of difficulty. I'd say you have chosen what most people consider to be a 'difficult' set of A-Levels, but of course those people will only be those who are not good at Sciences and Maths. Other people will consider them easy, as they are their chosen subjects. None of them are considered 'mickey mouse' though, which probably means they have more substance to them than newer, less respected A-Level subjects.
I personally am doing; English Literature, History, Biology and Chemistry, all of which are probably considered 'difficult' in the way that none of these subjects, too, are 'mickey mouse', and to the contrary are highly regarded. However, aside from Chemistry (which is supposed to be a hell-raiser!), I don't think these will be hugely difficult for me because they are all subjects that I am best at, others however, may find them excrutiatingly complex because they are crap at them. I, personally, would die if faced with a Music A-Level!