 Because of his father's problems, Sinclair had to move school several times.After a time at Reading School, Sinclair took his O-levels at Highgate School in London in 1955 and A-levels in physics, pure maths, and applied maths at St. George's College, Weybridge.During his early years, Sinclair earned money mowing lawns and washing up, and earned 6d (old pence) more than permanent staff in a café.