[mbivert]

I'd go a bit deeper: as we developed, in particular with the advent of the Internet, we went from scarcity of information to spectacular opulence. This demands different studying habits that what we had 30 years ago or so.

For example, we need to find ways to filter out noise from signal, or to connect scattered bits of knowledge from various sources to get intelligible solutions to problems (most problems can be solved by googling around, especially in maths/physics, because people of all levels have been asking/answering questions for Internet points e.g. on Stack Exchange & cie for many years now, but — take it as a feature — you have to work a little to get there).

EDIT: regarding solutions, it's not just about preventing cheating, it's because teachers wants you to do the work. The point isn't necessarily to succeed in solving problems, but more to have you try, get creative, etc.

Perseverance is crucial to move forwards. But they could still provide clear and/or progressive solutions, I fully agree.