There are three obstacles between you and your full bike licence: the CBT (Compulsory Basic Training), theory test and practical test. The theory test is the second element, made up of two elements:
1. A multiple choice test, consists of 50 questions randomly selected from a bank of 900. There are numerous books available listing all of the questions, such as Haynes Learn to Ride manual or The Official DSA Theory Test for Motorcyclists book. You can also practice online at www.theory-tests.co.uk/home/
2. A hazard perception test, consists of 14 video clips, each about a minute long, showing real riding situations. Practicing for this test is a bit more tricky than the multiple choice test.