A 19-year-old illegal immigrant who tricked a school into believing he was 15 was only exposed after he was arrested for stabbing two youngsters with a broken bottle.
Violent thug Niamat Miah even dated a 15-year-old girl while he attended South Dartmoor Community College in Ashburton, Devon, on false identity papers.
Youngster Chloe Wood, now 16, started dating Miah - who pupils and staff knew as Sabbir Ahmed - after he began at the school early last year.
His ruse was only exposed after an attack outside a nightclub in nearby Torquay, where he slashed two teenagers in the face and neck with a broken bottle.
During their investigations, detectives found out Miah was actually a foreign national living here illegally - and was four years older than claimed on his false Home Office papers.
Chloe told the News Of The World: 'It turns my stomach to think about it - he obviously wanted an education but I wonder if he also did it because he liked younger girls.
'I'm just glad we only kissed and cuddled.' She and Miah split after a month because he was too possessive, she said.
Miah was arrested after an argument turned violent outside the Take 2 bar in Torquay on June 10 last year.
The row turned violent and he lashed out with glass bottle, cutting Chris Prior's left eye and Lawrence Manders's throat, missing his jugular vein 'by inches'.
After his arrest, Miah told officers he was a 15-year-old schoolboy called Sabbir Ahmed when, in fact, he was an illegal immigrant who had been left in the UK by his parents in 2004.
He used false Home Office papers to enroll at two schools over a period of two years.
He first attended Dawlish Community College in Devon posing as a 13-year-old when he was aged 17 and transferred to South Dartmoor Community College as a 15-year-old when he was 19, detectives discovered.
At Exeter Crown Court Miah was jailed for four years after admitting two counts of unlawful wounding.
Sentencing, Judge Philip Wassall said: 'You have told so many lies throughout the investigation.
'Not only have you lied to police in trying to wriggle out of being held responsible for what you did but also to the court.'
The judge said it was a 'dangerous and wilfully reckless' attack and the victims had been lucky to escape more serious injury.
Miah is expected to be deported back to Bangladesh after serving his sentence.