Good question. I'm a drop out (a byproduct of paying for school while working in 2009) and it's been difficult to put my life on pause to go back. College grads get the luxury of having seen algorithms before and being taught how to negotiate and identify them in school with a fair amount of practice. I'm sure everyone studies for interviews, but for someone like me that study also often coincides with learning something for the first time. The industry now has a term for people like me, which is people from "non-traditional backgrounds". Many systems engineers, QA engineers, frontend engineers, etc will often be placed in this category.