Time management includes a thorough planning of your monthly, weekly and daily studying activities. Once you have become familiar with the study plan for particular semester/trimester and learnt about what is expected from you in terms of time you should dedicate to studies (I printed out for myself the study program for the whole trimester, with details about each courses topics and deadlines for submission of assignments and I pinned it up on the notice board) this would guarantee (I would argue) half of the success.