One of the finer points of that book is that it is a biography of Dirac's life, not just a description of his insights into physics. His personal life was unhappy and makes for rather depressing reading. When Feynman was described as a second Dirac, only this time human, it is difficult to appreciate fully just how fundamentally different the personalities of the two geniuses were.

Between studying electrical engineering and going to Cambridge he also earned a degree in mathematics, if I recall correctly. He was not given a sufficiently large scholarship the first time he was accepted to Cambridge, and so he had to wait.