The Mouse Efficiency Test is a test to measure your speed and accuracy when moving your mouse. The rule is quite simple - just move the ball along the curve to the other end attached to it. Please make sure you're not moving out of the curve and be as fast as you can. After 60 seconds, or if you lose track of a curve, the game will end. The count of curves you successfully traced is your score.
It might be somewhat hard for you - many of the rookie players would have an 80% chance to fail (lose track of the curve) in 60 seconds. However, if you want to be a pro-gamer, you need to score at least 30 points.