I started my articles a few months ago and I can seriously say the law society gave me more uphill then the employer in registering my articles.
In the interview depending on the type of firm your being interviewed for, mine is a specialist family law firm so I was merely asked a few questions about family law, divorce law and asked a few more questions about my experience and personality. They dont ask much about the modules you have done in context because most of them dont even remember the context of modules from back in the day so dont stress about that.
My advice however, be prepared to work all nighters, get minimum sleep, be running to court like a headless chicken, other then that show your professionlism and willingness to learn and most of all your perfectionism and you should be fine.
Good luck and let me know how it goes.