Study habits are hard to deal with and some students fail because of it. But of course, it was their fault why they fail. They prioritize their happiness rather than their studies. Students are called procrastinators. They tend to do things in a short span of time. It's either a day or hours before the deadline or at the time of deadline and that is what you called cramming. They prioritize on things which make them happy then cram the things they really need to do. Some of the students said that, their brain works properly when they cram because they worked faster than they usually do. That's true because I also had that kind of experience though there are some cases in which cramming doesn't work that well. In cases, like reviewing before the exams. Some students do some 'a-minute-review-before-the-test' thingy. They like it because they think they can answer the test when all of the things that they review are still fresh in there mind. On the contrary, some students fail on that thing. Like they'll memorize it for now then forgot it after a minute or so on. That's because their brains are not used in that kind of thing. And that's the reason why they fail. You can change those kind of habit but not in a simple way. You know, 'old habits, die hard'. But if you have the will, you can change it. It's just all about knowing what's your priorities, time management and having the will of changing your