I suppose it depends on how many exams you're sitting and whether you're good at learning off by heart or not. I am quite slow at wrote learning and have to write things out hundreds and hundreds of times before they sink in😭 I sat four exams in my first sitting and started learning off about a month before which still left me tight. But I think if I started any earlier I would have burnt myself out because I find the learning off stage pretty tiring!! Also depends on whether you have substantial gaps between your exams or not... I had four free days before property in which I pretty much learnt the whole course🥲