If you're not sure what Uni/career, is there any online psychological tests or questionnaires you can take to help you decide?

[NiteNight]

Just that really, my son is doing Maths, Further Maths, Chemistry and Physics.
He thinks he'd like to do Chemical engineering in Uni and as a career but is not sure.
Is there any online tools/tests to help him decide?
TIA

The subject should say "If you're not sure of what Uni Degree/career ..."