Stress is very common for students these days and videos games are the path way for many students to relieve this stress.
Call of Duty is one of the biggest video game franchises ever and is on of the games that helps the most with stress. Call of Duty has many was to relieve stress,
Campaign
Call of Duty has a campaign in each one of the games. A campaign is the lure behind the game. When you play campaign you get immersed in the game and it makes you feel like your in a movie controlling the main character.
Multiplayer
Call of Duty's main mode, being the most popular, is the multiplayer. In this mode you play against other player and get really competitive. The feeling of beating other real player is really good and makes you feel good about yourself.
It may sound weird but killing is a good way to relieve stress that others should try out.