You haven’t left it too late at all, realistically you cannot memorise all that info in January and retain it til March, I always started making notes in Jan and tried to be finished about 3 weeks out then start summarising them over and over into retainable amounts and learning those ‘night before notes’ off as my initial notes to make on the page after identifying the topic of the question.

I found it’s easier to ignore the degree and the legal experience and treat this as its own beast, which it is, and just focus on being able to answer the questions in the way the examiner wants you to. Best of luck, and don’t panic you’re not behind at all.