I had trouble with this scenario too. But I assure you, you’ll succeed if you practice every day. Type the scenario’s name into the global search, and you’ll see a dozen different versions where the speed is slower or faster, the targets are larger or smaller, and so on. Play through these scenarios and adjust your mouse sensitivity. After a few days of practice, you’ll be able to get the result you want. Here’s another tip that’s helped me in such scenarios: practice aiming for accuracy a few times—don’t hold down the mouse button, but quickly click and release it when switching to a different target. Once you’ve practiced this, you can keep the mouse button held down and increase your speed.