I don't pretend to be an expert in this subject, but from what I've seen there are no particular subjects needed for law. You just need good grades, to show that you are hard-working and intelligent. A good English grade might help, however, as law involves a lot of writing.
Maths and Biology are definitely two good A-levels. The other two seem a little pointless; law and psychology are both important job areas but A-levels in them don't seem to have any real value. For example, if a university was selecting students for a psychology course I think they'd pick the student with an A in Chemistry rather than the one with an A in psychology.
What about History or French, as you seem to be good at them? There are courses at university such as 'Law with French', and History certainly has a connection with law. Have you ever heard of the 'Bar Mock Trial'?
Different schools compete against one another in the presence of judges, and the pupils play the roles of barristers, witnessess, jurors and court staff. Recommend it to your teachers. It is a good experience if you are interested in law.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.