There will be three classes each in game year, which lasts two weeks, and each class will take place across three-four days. Success in each class will be determined by a simple dice roll, either a d6 or a d20, with modifiers attached. The modifiers will be based on your RP preparedness, the amount of RP you do, and the quality of the RP you do. Basically if you actually give a damn and try to get involved in the RP, RP being defined as character interaction, then you'll do well. If you don't... then you won't.
As a simple example, having your Brigandine on you when you arrive will give you a +1 modifier on your class roll!
Even if you don't say it in your post as long as you posted that you purchased it in the appropriate thread I will assume you're wearing it. If one has to be provided for you there is no penalty, you simply don't get the +1 modifier. However if you, appropriately, RP that you don't have one and make it part of the story, you'll just get the +1 anyway because you did good RP. Enjoy.
The first class will, formally, begin at 1300GMT on the 25/03/2012. The RP for this class will continue until 1700GMT on the 28/03/2012