I can totally relate to that.
I flamed out of calculus class but kept the 2-1/2" textbook.
It's always been there, ...if I ever needed it.

Ask me anything about some English Literature and I will Google it.
I don't know which King Henry commissioned the writing of which famous book. I failed that.
And nobody has asked me about it, ever. Henry IV? Henry VIII?
The
one thing I did learn in college, was how to tell when useless crap was being poured into my brain.

You need to time an injector pump to a CAT V8 diesel? I learned that

.
How to ground yourself so you don't blow the gate on a 80-amp IGBT, that I know.
Which books
Robert Louis Stevenson wrote, I can't help you with anything except the
Strange Case of Dr Jekyll and Mr Hyde .