Hi, welcome to the site, there is a recommendations thread for the
CYPW route here and handbooks for STL are available on
amazon.co.uk or to loan from your course provider maybe?
There are a few threads for ERR that might also help;
http://www.silkysteps.com/forum/showthread.php?t=16496
http://www.silkysteps.com/forum/showthread.php?t=15168
Best wishes with study xx