I passed the Prince2 foundation exam by getting the official Prince2 manual for ?40 on ebay being sold by a Learning Tree trainer and a book called Prince2 revealed which was a simple description of how Prince2 could be used in the real world. The manual is very dry/boring whereas the other book gave me the concepts and how it all fitted together.

I added Prince2 certified to my cv which was enough. I don't work in Project Management but I work with Project Managers and most people I know use Microsoft Project for the project plan and then Word for all the documentation such as PIDs etc.