Four girls in school uniforms in front of a blackboard HD Wallpaper

Four anime girls stand in front of a green blackboard with chalk drawings. The girl on the far left has short purple hair and is wearing a school uniform. The second girl from the left has long blonde hair and is wearing a similar uniform. The third girl from the left has short red hair styled in pigtails and is wearing a school uniform. The girl on the far right has pink hair styled in pigtails and is wearing a school uniform.