Signals should be given clearly, correctly and in good time. You should also be able to react to the signals given by others. When out on test people will look over and recognise that you are on test. Someone with a hi-vis jacket and a clipboard sat next to a nervous looking driver is generally a driving examiner. More often than not, they will try to help you. You should by this point have learnt to look at the other driver to work out what they are doing.