Is this a good choice of A Levels - Psychology, Chemistry, Media and Sociology/Law?

Well, I wouldn't do either sociology or law, because they are considered 'soft subjects', and are useless for many university entry to courses. Try and choose either a proper science, or a proper Art (listed below).

You have chosen a quite terrible set, because four of them are completely useless so you can't do anything scientific, but you are doing Chemistry which is one of the hardest A levels, all for nothing. but I guess you can do psychology or some IT course in media (but not computer science because maths and f.maths is almost always necessary)

LIST A1

Generally Suitable Science A-levels

Biology

Chemistry

Mathematics

Further Mathematics

Physics

LIST A2

Generally Suitable Arts A-levels

Art History

Chinese

Classical Civilisation

Economics

English Literature

French

Geography

German

Greek

History

Languages

Latin

Music

Philosophy

Religious Studies

ANYTHING ELSE is Useless and is only counted as a 4th AS for most decent universities.

I'd say its great. something like media studies, psychology and drama for example would be poor. But you have math and chemistry and those are strong subjects to accompany your artsy subject. Most people enjoy psychology so good choice on choosing that! Hope this helps!