Usually people will have trouble with a few questions from a practice exam and will post them in separate threads, or perhaps in their own question thread. However, this can become very disorganised. People who do practice exams at a later date will likely repost the same questions and if there is a mistake in the exam you can be guaranteed that many people will be asking the same question "why is my answer different from the practice exam's?". This would result in lots of redundant threads.
If we have a few stickied threads, or maybe even a sub-board dedicated to practice exam discussion (like the actual end of year exam discussions we have) it could make things a lot neater, and people who do their practice exams late and want to clarify something can read/post in that particular thread, rather than making another one.
This idea doesn't have to be restricted to practice exams of course, you could have similar threads for checkpoints or textbooks (although these might grow too big and unwieldly and might need dividing up).
An issue I can see here is the site's policy toward practice exams, which I am quite confused about actually...
Anyhow how does it sound?