A teenager who stabbed a fellow student in the neck with a kitchen knife at a Brisbane school has been found guilty of attempted murder despite his lawyer arguing he was "responding to bullying as he saw best".

In August 2013, when the boy was 14, he stabbed a fellow Year 10 student in the neck at Mount Maria College at Mitchelton in Brisbane's north-west.

At a hearing last month, defence barrister Robert East told the court the teenager had been subject to bullying and there was powerful evidence that he intended to threaten his classmate, not kill him.

Mr East said his client's age made him incapable of fully grasping the consequences of his actions.

The accused, who cannot be named, pleaded guilty to unlawful wounding but not guilty to attempted murder.

"He was responding to bullying as he sees best. He didn't think of all the possibilities," Mr East told the court.

He said the boy did not pull out a knife in front of a class and only wanted to scare one person.

However, prosecutor Sarah Farnden told the court that if the intent had been merely to threaten, all the accused had to do was brandish the weapon.

She said the evidence of intent started with the boy arming himself with a knife at home.

"The strongest demonstrative evidence is the act itself," she said.

Justice Jean Dalton handed down her verdict in the Supreme Court in Brisbane on Friday afternoon and revoked the teenager's bail.

"The facts of the case show an extreme reaction to emotional aggravation or anger, which weighs in favour of revoking bail," Justice Dalton told the court.

The boy, now 15 years old, hugged his parents before being led to the cells.

Justice Dalton adjourned sentencing to a date yet to be fixed.