You grab the blue line with your mouse and move it to create the shape or find the point in each puzzle. The trick is that you only get one shot, so you have to do a good job eyeballing the shape before you let go of the mouse. Once you have completed the seven challenges you take the test again (twice) t0 see how your score improves each round. Here were my results:
The lower your score gets the better, so I'd say I didn't do so bad after all.
Take the test and let me know how you did.