Baka to Test to Shoukanjuu illustration with characters HD Wallpaper

Three anime characters are depicted in a colorful, playful style. The character in the center has green hair and is striking a peace sign with a wink. The character to their left has brown hair and is looking away with arms crossed. A third character with blue hair and glasses is partially visible on the far left. The background features a rainbow arc and various pastel-colored shapes like stars and hearts.