I would love to be a scientist haha! The scientist career is the best one for me. I have GTW and still only have done a bakery. Very similar to his Go To School mod too! More space is definitely needed. Similar to what DarkAuthor13 said, you have to download the mod -and- the Venue List mod that will enable his custom venues to be listed in the game. The Sims 4: Active Careers Mod Now Available! You have to choose a lot and set it to the job location.
No, I believe Zerbu has uploaded buildings for the jobs on the Gallery. Does the mod include actual physical work locations that the can be played like the ones included with GTW? While this is nothing for me, there are certainly going to be a lot of people who will love it.
Getting a higher score and completing your daily task will result in higher performance which will lead to getting promoted faster. For players who have both The Sims 4 and The Sims 4 Get to Work Expansion Pack, Turbo Careers turns all closed adult careers into open ones, as well as two of the teen careers Fast Food and Barista with the possibility of more in the future.