There are lots of packages available to help you pass the theory test including applications for modern smart phones/tablets and websites offering help with hazard perception clips and the multiple choice questions.
The software package below is something that is highly recommended and available from a lot of suppliers including amazon for a minimal cost.
Theory Test Pro is an online service that allows you to practice theory test questions
and hazard perception clips. You can click here and register for FREE, you will then have access to a limited number of
theory questions and hazard perception clips, you can access all the questions and clips in 'Theory Test Pro' for free if you are a member of certain local libraries,
simply use your library card number to gain access. If you don't want to join your local library you can still access the full bank of questions and clips by paying a small fee online.
Local library memberships where Theory Test Pro is available are listed here.
Try entering entering 'free online hazard perception test' into your search engine, lots of sites now let you take mock hazard perception
tests similar to the Driving Standards Agency hazard percpetion test.