Natural Selection in a 3rd world country

Its just another normal day in school when the alarms suddenly rang and the speakers turn on "students will be chosen randomly and will be sent to a certain place." That was the last thing I heard. The next thing I knew, I was in a city; it looked like it was a newly abandoned one. I looked around and saw a bag. It was a medium-sized bag with a note on it saying, "Students all over the country have been brought here to compete. Do your best to adapt and survive. This is a test from the government."