I find that staying calm helped me focus on the tasks at hand in the 3-in-1 test. For the shapes and numbers tasks, I've realized there is sufficient time to react instead of fidgeting to press the button. If your instinct tells you to press the button, you should probably take the half second to rethink. Logic over instinct for this test. Also, keeping one hand on the keypad will make your reaction time much less for the shapes task.
As for the fly through square test, my problem lies with over correcting initially as I want to line up the flight path. If I did less changes to the path in the beginning, I would've been in better position for the rest of the squares.