Jamie Gagliardi, 18, was so determined to swot up for his upcoming psychology exam that he refused to leave the premises.
Teachers then called the police who escorted him off the premises at Ifield Community College in Crawley, West Sussex.
A spokeswoman said later: "He was causing a nuisance and a disturbance."
Jamie said: "I've been punished for wanting to do well. I am a hard-working, dedicated student.
"The college has overreacted in what is probably the most important week of my school life."
Jamie explained that he was given a one-day ban from the premises last Wednesday for interrupting the headteacher during a meeting.
This meant he was not allowed in the next day, but Jamie claimed he had "nowhere else to revise" as he does not have a computer at home.
Bosses at the school said the student was 'obsessed' with after-school tuition and they had to call the authorities because he was causing a nuisance by refusing to leave the grounds.
Marilyn Evans, director of administration, said: "He became irritated that he couldn't have after-school revision, which he seems to be obsessed with.
"He probably feels that without extra sessions he won't get the grades he wants, but he will. He is a top student."
Police said Jamie will not face charges.
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