Author did a high school exam paper on his book - and failed. True story?

The physics professor, Dr. Phineas Welch, has gotten himself slightly drunk and begins speaking with Scott Robertson, a young English teacher. Welch announces, "I can bring back the spirits of the illustrious dead." He goes on to explain that, via "temporal transference", he can bring people from the past into the present. At first, Robertson treats Welch's story as an amusing, alcohol-induced fantasy, and he begins to enjoy the conversation. Welch says that he first tried bringing eminent scientists from earlier eras—Archimedes, Isaac Newton, Galileo Galilei. However, none of the scientists were adaptable enough to handle twentieth-century society; Welch realized that he needed to find an adaptable, universal mind.

"So," he continues, "I tried Shakespeare." This startles and incenses Robertson, since it strikes "closer to home". Shakespeare, according to Welch, was flexible enough to understand human beings of every era, and he adjusted to the modern world much more easily. Welch reports that Shakespeare was eager to find what future generations thought of him. When Welch finds him a book of literary criticism, Shakespeare cries in exasperation, "God ha' mercy! What cannot be racked from words in five centuries? One could wring, methinks, a flood from a damp clout!"

Eventually, Welch says, he enrolled Shakespeare in a night school class on Shakespeare's plays—taught, as it happens, by Robertson. At this point, Robertson begins to become genuinely worried. He recalls a bald man with an unusual accent, and starts to doubt whether Welch's story was all alcoholic fantasy. Timidly, he asks Welch what happened, and the physicist explodes with anger. Shakespeare had been humiliated, he says, and Welch had to send him back to 1600: "You poor simpleton, you flunked him!"

Asimov comments that he wrote the story to get back at English teachers. Additionally he says, that the story is really about himself. Not being able to answer most of the questions he's posed on his works, he realizes he would probably flunk a test on himself.