The 2 weeks notice thing is almost definitely set in stone from what I can gather, I don't have any hard evidence with me, and I'm too busy to look it up but I'm sure I've read it somewhere. As for the non-assessment period for 2 weeks beforehand, well our school doesn't follow that so I'm guessing it's not a rule or my school just sucks. However, it is policy at my school not to schedule any assessments after trials, so I guess it's all upto the individual school.