try not to rely soley on any textbook, in terms of theory i am loving the one by derwent/hamper/draper, but the examples/cases are still lacking...although they are alot better than heinnemann and excel
there are many errors, but I can't remember all of them at hand, sorry. there are a few errors in Macquarie Revision Guide too. Try to use heinemann primarily, but also, look in newspapers for media reports because some information has changed since they were all written,... especially stuff on global environment.