1，only have must-do, may-do, can-do list and an estimation for tasks, not fixed time to do it.
2, do things you are very excited to do at that time, do it until you are tired or finished.
3, if you don't have anything particularlly interested, do things you don't want to do most.
4, finish all the must-do things in the list at the end of day, don't leave it for tomorrow.
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1, no fix time to do anything
2, do all things in must-do list
3, do whatever you are excited to do