Liam Lyburd, 19, is on trial for allegedly amassing an arsenal to target Newcastle College in northern England. He was expelled in 2012 for being disruptive in class.
Prosecutor Nick Dry told jurors at Newcastle Crown Court that a file recovered from Lyburd's computer titled "Newcastle College" said: "You ruined my whole life ... I will teach you a little lesson on respect with my 9mm hollow points."
It also said, "yes people will die, there's no question about that."
