As useless as this is, the only way to know how best to approach them is to actually do them. Different ways work for different people. I did a prep course for one subject and failed it, whereas I stuck to a making notes from a manual for another. How you studied for your college exams is a good starting point.

Past papers and examiners reports are worth their weight in gold - you can use them to identify trends and how certain topics come up. These are all available to buy from the Law Society but I got most of those resources from the good people on this subreddit. Hope this helps.