20 Things You Need to Know About Einstein - Did Einstein flunk math? - TIMEIn 1935, a rabbi in Princeton showed him a clipping of the Ripley’s column with the headline “Greatest living mathematician failed in mathematics.” Einstein laughed. “I never failed in mathematics,” he replied, correctly. “Before I was fifteen I had mastered differential and integral calculus.” In primary school, he was at the top of his class and “far above the school requirements” in math. By age 12, his sister recalled, “he already had a predilection for solving complicated problems in applied arithmetic,” and he decided to see if he could jump ahead by learning geometry and algebra on his own.