each law course differs slightly so its best to check each university's website and check their individual course structures. some of the questions i asked were things like what other unis they applied to and why they chose this uni to do law (if talking to students), what optional modules they recommend you take/which ones tend to be the easier/harder ones (i asked this in relation to becoming a solicitor and if there are any modules that would benefit me more with things like the sqe and going into commercial law). what law firms does the uni have strong connections with. you'll also want to ask students what they don't like about the course and i get that its an event to promote the uni, they'll give u semi-honest answers. for this reason i'd also reccomend asking students outside of open days too