Oh btw on assessment day you cannot get above class 3 (e.g. to get to class 1) you need to have further tests in detail (eyes, ears, dental, blood etc) The class most of us got put in was one of the class 3 groups which means we are on the way to class 1 pending these further tests and/or and other medical issues are completed or resolved.
Also why class 3? I don't know why that number, but i do know that class 2 is something totally unrelated to pilots (medical guy told me i just can't remember the name), they jump from class 3 to 1.