CBT is indeed for 125....but is also a rquirement for the other tests if you don't already have it. The current UK bike test comprises of 3 elements (additional to the CBT)....theory test, Module 1 test and Module 2 test. Module 1 (Mod1) is an off road manouverability test which has exercises like: swerve test, u-turn test and a figure 8 test. Once this has been completed successfully you then do the Module 2 test (Mod2), which is an on-road riding test which is monitored by an examiner either on another bike or occassionally in a car. Hope this answers your question. Unfortunately = British humour....