I'd say, if it is incomplete, people would have found the missing (global) hidden variables by now. Again, the problem with QM is how to interpret QM to match our intuition.
I believe this is the best advice. In addition, we probably need a lot of quantum computer (QC) programmers in 5-10 years. I'd think a high school student who has learned some Python should be able to start learning QC programming.
https://qiskit.org/learn/
The math needed is not that much to...