For those of you that find Spatial Reasoning tricky...
'How To Win At Aptitude Tests'
Iain Maitland
This book contains numerous examples of the folding cube exercise.
The Psychometric Test book by Parkinson is fantastic and well worth the money.
In general there isn't a huge amount of practice you can get on spatial reasoning but here are a few sites that Parkinson recommends for practice papers etc...
http://www.profilingforsuccess.com
http://www.shldirect.com
http://www.faststream.gov.uk
http://www.ase-solutions.co.uk
http://www.morrisby.com
http://www.ukcoursefinder.co.uk
http://www.testingroom.com
http://www.allthetests.com
http://www.psychtesting.co.uk
My friend has recently been given an offer as an Investment Banker in the City with ABN. He had similar selection style tests, and gave me some practice papers. SHL are widely used by many recruiting companies. My friend told me to look on the JP Morgan website too.
McKinsey & Co. a high-end consulting firm also offer some guidance at
http://www.mckinsey.com - This might be going a bit too advanced but it gives you an idea.
Hope this helps,
Kirk