I guess it varies from uni to uni. But:
- Don't bother remembering the citation
- The year... Sometimes relevant but I wouldn't go stressing over it, unless the year is key to that era of law
- Keep the facts to a minimum, just stick to the material facts
- Legal principles is what you focus on, how did this case change the law, and why?
For something like Adams v Lindsell it doesn't really matter that it was wool, nor that the letter was sent on 2nd september or arrived on the 5th september, or when the letter of acceptance had arrived, or who the wool was then sold to and who then sued who for what.
For the above in an exam I personally would just say, ... the postal rule as formed in Adams v Lindsell where it was debated as to if and when a contracted could be formed if offer/acceptance was to be provided by way of post. It was held that a contract is formed at the time a letter is posted and not upon receiving the letter.
Then maybe go on to just justify the reasoning behind this and any criticisms etc...
- Why was it decided that the contract is formed upon postage?
- Despite the decision does it cause any injustice? (people may not even know they are bound to a contract if the contract is formed when posted - is this right?)
- Are there any gaps in the law it did not clarify? (email?)
- When doesn't it apply? (exceptions to the rule)
- Academic/Judicial criticisms of the decision?
Obviously it depends what the case is and how important it is. A lot of people waste so much time regurgitating the facts of the case that are so irrelevant. It's much better to stick to a brief outline of the material facts and then really analyse the ratio decidendi by giving an academic/social policy opinion on it.
I hope this helps, in a nutshell I'm trying to emphasise that you shouldn't get too technical with the facts unless the area of law is technical and the exact facts are fundamental to the law. You reap many more marks for briefly outlining the facts and then really analysing them.
To answer your original question I don't think there's an easy way. I write the name of the case, the facts, and then the law behind it. Then just go over it over and over again until I have it lodged in my brain. You can use memory techniques like the method of loci if you're serious about it.
Hope this helps,