@emli1000 I would say it's somewhat important for keeping track of your pace. The required clock in the room may not be in front of you. In my testing room, it was behind me which would have wasted precious seconds if I were to turn around.
If you're staring at your computer screen, try using: https://justgetflux.com/ It will adjust the light of your computer screen to adapt to the time of day so you're not always on the brightest setting.
Nope.... but as @nicole.hopkins said... I think purchasing the books would be cheaper and those pink erasers come in handy. I would get cambridge if you want them in PDF format.
Yes—I mean, how many times do you want to retake those early PT's, really ... If the answer is ≤1-2 times, then the books are most affordable and you can sprinkle your room with pink dust like I have ... #noshame