Nailed my third year at Cambridge
Honestly, the most important things you can do are 1) get some decent textbooks (rather than wasting time with some of the ***** that lecturers might put on the reading list such as Treitel on Contract), 2) use multiple different textbooks especially textbooks which give a critical view of things, 3) make structured notes that give you a clear structure to apply in exam questions, 4) be brutally exam focused (i.e. in many subjects you can drop huge parts of the syllabus because you know you don't need them to answer the necessary 4 out of 10 questions, 5) practice writing exam essays, 6) make sure you read journal articles (or even just the introduction/conclusion) so you have some nice alternative viewpoints, and note that these are ESSENTIAL for essay questions, 6) don't even think about answering an essay question in an exam if you don't have journal articles to use and if you aren't 100% clear about what the question is asking - if you've revised the specific issue an essay is asking about and know where you want to take the essay and are prepared to be very controversial, essays are an easy route to a first, but if in any doubt stick to problems.
Everyone learns differently, but my top tip is to really make your learning about quality rather than quantity. Really try to maximise your productivity, don't waste time reading unimportant cases or confusing textbooks. Always think to yourself if you could be doing something more useful.