Hi there,
I'm a law student. I took Physics, English Literature and Psychology and knew little about Law. In all honesty, you will learn all the skills and will be provided with basic knowledge at the very start of the year. In terms of preparation, before you begin university, I would recommend becoming commercially aware with the news and reading various news article. BBC News and Guardian are great platforms to read the news.
Furthermore, during your time at university, make the most of it by having 1 to 1 sessions with the lecturers, attend many workshops in your university which will help you develop different skills such as referencing skills, learning to read and analyse primary sources (cases and statutes), which again you will learn from the start of the year.
Additionally I hope this is the case in every university, but my university offers students workshops to improve their essay writing skills.
I hope this helped.
Best wishes,
Coventry University Student Ambassador