exam_grab_entrant_position_effect

exam_grab_entrant_position_effect = {
	scope:activity = {
		every_attending_character = {
			limit = {
				exists = var:imperial_examination_score
				var:imperial_examination_score >= root.var:imperial_examination_score
			}
			add_to_list = exam_position_list
		}
	}
	set_variable = {
		name = your_exam_position
		value = list_size:exam_position_list
	}
}

As written in game/common/scripted_effects/tgp_imperial_examination_scripted_effects.txt.