A click test 30 seconds is not very different from the regular click speed test. The process, format, and everything else is the same, except the time limit. Just how the 1 second CPS test displays the score automatically after one second, this click test of 30 seconds automatically displays the total number of clicks, your rank, and the clicks per second after exactly 30 seconds of starting the game.
30 seconds is a long time so when you start clicking, you will need a strategy and a plan as to how you will be doing it. You can choose from the different styles of clicking like jitter mouse clicking or butterfly clicking and practice. This will help you in increasing your clicks per second over a long time interval. You will only be able to decide on a perfect strategy once you practice enough using different methods.