Yes. First, call 911. Then, if their dead you move on to the next victim. If they look like their going to die from their injuries, you move on to the next. If they look like you can provide aid with what you got, you help them. If there is multiple people and you can do it, write down what you do to the victim and put it where a 1st Responder can see when they get there.

Yes this is cavalier, but its honest. You can't save everyone all the time, and you shouldn't treat outside your ability.