I know it depends from person to person,,, but what's the estimate? I remember someone posting(I don't remember who) that relying on intuition to solve problems is a bad habbit. It just means that I'll have to start studying from the scratch? Let's say I want admission in one of the top 100 colleges in the world for masters in physics. What does it take in terms of work? Also can you share your college experiences of how you studied? In the past I've managed to pass by doing minimum work in all subjects except maths.(Maths being an exception because I had an excellent teacher.). Furthermore I'm not getting admission in the best college for bachelors in physics because of problems like laziness and procrastination in studying etc,, but I intend to change. Please help!!. Thank you!!