A closer look: How many school shootings since Newtown?

[jimmy the one]

34. no lie, but a bit misleading I suppose

the link: Everytown says on its web site that it gleans its information from media reports and that its list includes school shootings involving a firearm discharged inside or on school grounds, including assaults, homicides, suicides and accidental shootings.
Some of the other incidents on Everytown's list included personal arguments, accidents and alleged gang activities and drug deals

CNN determined that 15 of the incidents Everytown included were situations similar to the violence in Oregon -- a minor or adult actively shooting inside or near a school. That works out to about one shooting every five weeks.

15 evidently were 'planned school attacks' if you will, while the 59 others were evidently spontaneous or not intended to be an attack on school students or personnel per se. A truer representative number would be somewhere between 15 & 74, to exclude general mayhem with guns.
Doesn't include property crime committed with guns, on school property, either, to my knowledge.