Advice like this (which itself is good) makes me wonder how much higher education is missing. If a 4.0 is possible with 1.0 hours of work, then surely the expectations of the students are far too low. Its great that its possible for a focused student to achieve a 4.0 with so little work, but doesn't that just mean that all the students should be achieving so much more?
Perhaps there should be a compulsory 101 course that just teaches studying skills (some places may do this already). It seems like that would boost the overall gain from the education experience.