knight_teacher_effect

knight_teacher_effect = {
	if = {
		limit = {
			scope:educator = { has_character_modifier = knight_teacher_modifier }
		}
		change_variable = {
			name = education_martial_variable
			add = { integer_range = { min = 1 max = 3 } }
		}
	}
}

As written in game/common/scripted_effects/00_education_effects.txt.