There was some amazing material produced for the previous revision of AH (when it changed from SYS to AH). Some of this material is out of date, but most is not. It is a shame not to share it, especially as the previous host Education Scotland has removed the materials from their site. These materials should not be sold and should only be used for educational purposes.
further AH questions These ought to be named, good simple starter questions for each part of the course.
Guide to excel 5795 This is a little out of date but still contains some cracking materials.
Uncertainties Norman Fancey Gemmell Millar This is a great document and essential reading for all those who want an excellent introduction to Uncertainties at this level. Ignore the parallelogram plot though.