I alone fight in the apocalypse

This is a story that follows a high school boy that has found himself thrust into a zombie apocalypse, but he is not alone. Following him are some of his classmates. These people had decided to follow Adam since he had shown that he could help them. Though how long until Adam decided that the classmates following him are dead weight. Maybe he could find a diamond in the rough within the group of classmates that don't want to do anything.