There's so many routes into law nowadays that you don't even have to do a law degree specifically, you don't necessarily need specific subjects if you were to be interested in law, but definitely don't go down the medicine route if it isn't where your heart is, my friend picked all her a levels based on medicine and in June realised she wants to do architecture but she hasn't had time to prepare and research architecture, you don't want to be in a similar position it's so stressful, and she hates all her subjects. I wish you luck