Postgraduate Mathematics
The Ring Theory and Representation Theory notes have been used for many years at Macquarie University for the Honours Algebra course. The Quadratic Forms notes were once used for a postgraduate course.
The prerequisite knowledge for the Ring & Representations is mainly Group Theory (Third Year), plus a lot of knowledge about Vector Spaces (Second Year). The notes on Quadratic Forms mainly require a good knowledge of Vector Spaces.
The Atlas of Finite Groups give character tables, and other information, for finite groups of orders up to 100, excluding orders 64 and 72.
This is still being constructed and so far it only goes up to order 63.