The theory test can be taken any time on or after your 17th birthday. It needs to be passed before the practical test can be booked. Both tests can be booked online here. The theory test is currently £31.
There are some practice tests that are free at the DSA web site . For further help below are links to some products that we recommend to help with your theory test. If you have a PC then the Driving Test All Tests DVD is all you need to revise for your theory. If you have an Apple computer or no computer then the Hazard perception DVD combined with the Nintendo DS game and /or the DSA theory test book will provide all the information you need.
More Information can be found at the DSA website.