Here's a Smart Worksheet for past papers taken from both January and May's 2012 exam papers.
The worksheet includes worked video solutions of all the questions. There's a host of extras and useful tools too. Resets are also included so that you can keep track of how you are doing.
There's also an email? button so that you can submit any questions on this topic you might have.
Hope you enjoy this sheet and any feedback is always appreciated.