If you can face a new challenge with confidence, despite not knowing how to yet to solve it, it’s because you can say to yourself,
“I’ve solved problems before.”
Best to have solved all kinds of problems. Home maintenance problems and musical problems and trigonometric problems and rhetorical problems and linguistic problems. Emotional problems and interpersonal problems and temporal problems and familial problems.
That’s maybe the most important lesson you can take from your education – not how to solve any one problem, but the confidence to know that you can solve the problems you’re faced with.