University course pages for Paramedic Science will state the entry requirements - be mindful that these can vary slightly from uni to uni but much is the same. Here's an example https://courses.uwe.ac.uk/B950/paramedic-science#entry
GCSEs - English, Maths, and Science (sometimes double science).
If you don't have A-levels you can do the route I've done and do an Access to Higher Education course in paramedicine (college taught or online). I didn't do well in A-levels when younger so this provides an alternative if the right grades are achieved and the correct UCAS points are met.