Acronyms are a great way to remember stuff. ANDS, UNOS, OSUN, Some Old Hags Can't Afford Homes Till Old Age, CFAGGSLIE, ARROW, etc... I have FAA certificates, so obviously a little different in some areas.
When I was doing my ATPL tests I made up my own mnemonic tools, but here is a link to a document that also has some:
http://www.freelancepilot.nl/ATPL%20summary.pdf
I didn't end up remembering it, but I thought the tool to remember the different parts of ICAO was pretty good.
Good luck.