Want to work directly in pro motorsport?
Be the best at what you do. Have heaps of qualifications.
Have a reputation. Start in a lower series. Prove that you want to work long hours in an extremely competitive, sometimes exhaustive environment, for pay that may not be spectacular.
Even on FSAE teams, lots of people show up "Oh this is awesome, I wanna work on the car!" but few man up to put in 70+ hours a week, including weekends.
Even as a motorsport supplier.. there are some things that are fun and rewarding, but there are a lot of things that are a huge pain in the ass.
I don't understand why so many people want to jump to F1, particularly immediately out of college. Why not GP2? Why not F3? You've got to prove yourself. A university degree with no REAL experience is a long shot.
Grip is a four letter word. All opinions are my own and not those of current or previous employers.