Never been asked to see my certificates, although I assume they are on record anyway lol. AS law is very memory-based and all of the topics are systematic where essays are concerned. Don't be fooled by big words and latin phrases, looking over each topic briefly and take one page of notes on their main points will stand you in good stead for any exam question. Have a chilled out no-stress revision session and take the exam. Worst case scenario - you fail. So?