Ok...
#1 you have to make an appointment with yourself about your time management;give yourself a hard punishment if you're failed ex:75 push ups
#2 find yourself a rival,partner and a motivator(friends are the best),find someone that have same problems like you,ask him/her to change together
#3 don't just sitting and thinking that you want to change;take an action,do what you can do ASAP
think you can do it?then do it now...
wish you succeed ;]