[yakak]

This is very common and pretty much the default either directly out of a school with a weak program or after working in industry in a niche that doesn't use what you've learned.

The introduction of MOOCs like edX, Coursera and Udacity were great and most of them offer free auditing of classes. If I were fresh out of school I would take my transcript and go through the classes again in roughly the same order but dive deeper into the subjects that interested me most while perhaps only listening at double speed to subjects I don't find that interesting and don't think will come up in real life.