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Film about students

The film has voice-over of the main character who falls in love with one blond classmates of his, but afterwards he is going to feel romantic affection towards this hippie girl who is all into anti-nukes meetings and other revolutionary stuff. The boy and the hippie girl are having sex and he mistakes her name by saying the name of the blond one. Afterwards, he and the blond girl are going to a student quiz and he'll the answer the last question correctly before it was even asked, because earlier he sees the answer unintentionally. I think that they will be disqualified from the quiz. The film ends with a scene where this boy goes back to school after the summer brake, the next year and starts searching for the hippie girl only barely saying hello to the blond one.
asked Jul 8, 2016 in Name That Movie by B. M. S. (46 points)
How old is the film?

It reminds me of a very old one:
"The Magic Garden of Stanley Sweetheart" (1970)

https://en.wikipedia.org/wiki/The_Magic_Garden_of_Stanley_Sweetheart
Unfortunately, this is not the one. In this film of mine the main character looks nerdy. Maybe of some help would be the information that in my native language this was translated in "The 10 Points Question" or some other number on the place of the 10. Thanks, anyway.
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