Kohi click test is another way to identify ration of clicks per second (CPS Test). In simple terms, it is just an alternative way to know how fast can one click the mouse in a given time frame.
However, the only difference is that Kohi is a Minecraft server. Usually, to perform better, players that play Minecraft (player versus player combat) are required to have quick clicking speed.
Also, playing the game can enable players to improve their clicking speed while keeping an aim.