Don't quote me on this, I'm not looking to do medicine ^^
The A-levels look fine to me (from experience of friends applying for medicine), just keep all 4 or drop psychology/rs. From what I've been told from friends looking to do medicine, there's no point in doing maths if you're going to get an awful grade in it...
Also, if you're worried about GCSE/A-Level grades, doing something such as Chemistry/Medicine related sciences at uni (though some do require maths...) can be a good way into a course in Medicine (so I've been told, I wouldn't take my word for it without checking...)