For law at uni (as you will be studying multiple compulsory areas of law, not just criminal) it honestly doesn’t matter what A level subjects you take, as long as they aren’t subjects like critical thinking etc
Subjects like English, or history are sometimes preferred, but in all honesty, any essay-based subjects will be helpful in preparing you. There’s no subject that will look ‘good’ specifically for criminal law.
That being said, some subjects at A level have elements of crime within them, eg A level law, you may study Criminal law, A level psychology, you may study forensic psychology, and with A level sociology there is crime and deviance.
Long story short, just study what you will enjoy the most
There are no required subejcts for Law - you just need high grades. Some people find an essay-based subject like History, Politics, English Lit, useful for skills but this is not essential. Maths and Sci students do well in Law - logical, scientofic approach - so what ever A levels you are doing, Law is a possible degree subject.
Pick 3 subjects whicj you will enjoy studying, and were you feel confident of hogh grades. Its slso worth thinking about what else you could do with your chosen A levels in case you change your mind about Law.