Doraemon (1979)

Nobita's 0-Point Escape Plan (7x50)

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Not wanting to get a 0 on his test again, Nobita uses the Time Machine to travel to the future and cheat so that he can get an A. However he is stopped by his future counterpart. Nobita decides to travel back to the present and study for real in order to pass his test. His plan succeeds and he gets a passing grade much to the joy of Tamako and Doraemon.