There are NO specific subjects required for Law - you just need high grades.
Some people find an essay-based subjects (History, Lit, Sociology etc) useful for skills but this is not essential.
So, pick three subjects that you will enjoy studying and where you feel confident of getting A grades.
And go to some Uni Open Days in the summer term and listen to the Law subject talks - is it actually what you though it was about? Look at other Uni subjects like Social Policy, International Relations, Poltics, Criminal Justice, etc to see if they also interest you.