can anyone give me some studying sources?

[Smcart5]

I just failed my hot water exam as part of the course i'm doing (mainly because most of the questions were about things not covered in the course)
Can anyone recommend some reading material on hot water systems, specifically the areas that the 6129 tech cert covers.

 

[anz]

Book:

Plumbing NVQ and Technical Certificate: Level 2

Website: SmartScreen : Home - A very useful site from City & Guilds, gives example questions and answers and some very useful information. Also because its from City & Guilds you know that its going to be included in the course.