The Drone Flyer Theory test is not difficult and does not aim to catch you out. Applying some common sense and the drone code; you should be fine.
Always keep your drone or model aircraft in direct sight (you cant use binoculars or FPV camera).
Never fly closer than 50m to people. Even when your drone is more than 50m away from people it is safer to avoid directly overflying them.
Never fly closer than 150m to a crowd of 1,000 people or more. Never fly directly over a crowd.
Never fly in an airport's flight restriction zone.
Never fly more than 400ft (120m) above the surface and stay well away from aircraft, airports and airfields.
Never fly closer than 50m to buildings, cars, trains or boats.
Never fly closer than 150m to built-up areas.
Never fly directly over a built-up area.
It is illegal to fly a drone or model aircraft between 250g-20kg that does not show a valid operator ID