I do AQA psychology, I've just sat the first AS exam. Honestly it's not as interesting as I thought it was going to be. A lot of it is study based to illustrate points and I just don't love it personally. But it will depend which topics your school picks. Next year were doing forensic psychology, which is interesting for me as an aspiring law student.
If you're like me and have a good memory it's a walk in the park because it's basically a giant memory test and you can make up evaluation points using common sense. I've been getting As all year from the off.
Also, don't take this as me saying it's an easy subject, it isn't. A lot of people fail because the content is just too big. My friend is pretty smart and she is really struggling to get above a D in Psychology but her other 3 subjects are fine.
Of course, A2 is likely to be harder, but I've found AS to be okay really.
Can't comment on classics, I wanted to do it but no where near me offers it.