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This has not been revealed in detail, except that it happened sometime between "The Name of the Doctor" and "The Day of the Doctor"; it is implied that a significant length of time elapses between the two episodes. The 2016 comic book story "Clara Oswald and the School of Death" (comic story) is the first story to actually confirm that Clara attended teacher's college, but it does not clarify whether or not she was training to be a teacher during the Series 7 timeframe while she was working as a nanny.