I'm a STEM student and chose firms that rank highly in life sciences/IP of that area, but that also have a lot of range so that I can try out different practice areas that aren't associated with my degree at all. However, I knew I definitely wanted a sector focused firm, and with one of those being life sciences. Sorry if that's not helpful! Also, you can normally apply to a bunch of first year schemes (I didn't realise until this year - I'm a final year non-law - but definitely look at first year schemes and open days so you don't have to cram loads into your first semester of final year)