don`t worry about Caa test,download DRONE CODE and all info there to pass test, most questions about drones, its about knowing Law and where you can and can`t fly, i have just done test out of curiosity as have "A" cert, got 20 out of 20 so not hard, 16 needed to pass, they want your £9 so do not want you to fail, test is free £9 is to register and you then get flying and reg I D No`s ,reg No to go on model.