firstly, IMHO you are massively overthinking it. always make rear observations before signalling and moving, and lifesavers are there to save your life, not as a test objective... if you feel you need to know whats alongside you for your own safety, then do one( a lifesaver). there is no such thing as too much observation..but theres definitely such a thing as too little. stop thinking so much, start feeling it. grow eyes in your arse and you wont go far wrong. seriously though, the examiner isnt looking for textbook, they are looking for a smooth safe confident rider. learn to feel whats right , ride smoothly , and be 100% switched on, always look, always signal...and enjoy the ride