The LakelandsComputing website, http://lakelandscomputing.com/index.html contains a lot of theory and guidance on topics for both the iMedia and Computer Science courses.

This website also contains pages with links to other revision resources:

Computer Science: http://lakelandscomputing.com/cs-revision-links.html

Creative iMedia : http://lakelandscomputing.com/revision-material.html

There is also a small section on how to revise: http://lakelandscomputing.com/revision-overview.html