On-line via the internet
The easiest way is to book on line, considering you are already using the internet to view this page!
Visit the Theory test bookingWeb Site
You should be able to:-

By Phone
The most popular way to book the theory test is by telephone, using your credit card or debit card. The person who books the test must be the cardholder.
If you book by this method you’ll be given the date and time of your test immediately.
You can do this by calling 0870 010 1372 at any time between 8am and 6pm Monday to Friday.
minicom machine phone: - 0870 010 6372
Welsh speakers can telephone 0870 010 0372
Northern Ireland: booking and enquiries 0845 600 6700
When you phone you should have your or the candidate's provisional driving licence number and your credit or debit card details.
You will be given a number.
Take this with you when you attend your test.

By Post
No credit card or cheque card.....no problem, just book the test via post.
Apply for your theory test via application form which you can get from:

• Theory test centres
  
• Driving test centres
  
• An Approved Driving Instructor
  
• The national test booking line 0870 010 1372
  
• Download from the DSA website HERE

The Postal Address to send the completed application form with your payment either by cheque or postal order ( do not send cash) is shown on the form.

Special Notes
If you wish to cancel your theory test appointment, you must give at least three whole working days notice, or you will forfeit your theory test fee. For example if you want to cancel your test and it is on a Tuesday, you will need to ring the booking office by the previous Wednesday afternoon at the latest.
You can not book for another test until the next day after failing. This is to give time for the booking system to be updated