You need a provisional driving licence to book your theory test.
There are two parts to the test:
You can simply book your test by clicking the button below.
Any day from your 17th birthday. And in some cases when you are 16 if you apply for a Personal Independence Payment (PIP).
You need to take the theory test before you can sit your practice driving test in order to get a full car driving licence.
If you are upgrading from an automatic licence or already have a category B1 driving licence (3 or 4-wheeled light vehicles) you don't need to sit the theory test.