This is only a suggestion based on what my asawa did.
Study the official book and the relevant chapters.
From a good bookshop like waterstones buy a couple of additional guides with CD practice questions. There are two main CD's. One CD covers government issues (including councils, political parties, workings of Govt etc) the other covers practical Life In UK (stats, helpful uk living hints, legal etc)
You take a different test each run with all results and full details of incorrect answers etc.
After a certain number of 'runs' with each CD you will consistently know the answers and achieve a pass score.
The key is to know the answers to the likely questions. The test is multi-choice so the chioces themselves will 'jog' your memory
