You must stay at the school with the other survivors who have stayed in the city, defending your camp and surviving. By using the different materials collected for construction, you can increase the defensive capabilities of your camp. These zombies like to raid your camp when your attention is relaxed. You can plant some food in the free areas of your camp or raise chickens to get eggs. In the absence of food sources, this is an essential skill to ensure survival. Surplus crops can also be used to trade with other survivors.