It's not just high school -> college. I remember in elementary school they were always like "oh you think this is hard wait till you're in middle school"
and then in middle school "oh you think this is hard wait till you're in high school"
And then in high school "oh you think this is hard wait till you're in college"
But each step it felt like some things got easier and others got harder but in general it felt like a pretty smooth progression with no major change in difficulty