Round 1: dead. The majority of my school is fairly athletic and I'm not particularly charismatic.

Round 2, however, would be a different story. As I already have the dark side of the Force, my usual pacifism and general appreciation for life are likely gone, and if not, that unlimited money can be used to make the world better and make up for it. We'll start off in my biology class. I immediately use the Force to block the exits and do one of those Force lightsaber throws to decapitate my teacher. Then, with a combination of Force-thrown desks and lightsaber combat, I proceed to slaughter my class, except for one strong student who I mind-trick into taking my lightsaber and becoming the "killer," while I take his saber and play the hero. The newfound killer goes to the next room and kills a few before I enter the room and "save" the students. When they least expect it, I do the same thing to them, and the pattern repeats until the entire school is dead. This way, the other classes will likely hear the terrible sounds, but not know that I was involved, as they would be unable to see inside or gain access, but when they saw the red saber they would assume the holder was the culprit.