Can you always stick to your plan ?

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I have been hoping to change my life by increasing my efficiency. I think the best way is to make a good plan in advance and stick to it. But I have been trying for years to do so, I am still not on my way. I always feel that every time I setup my plan, things just always happen that stop me from doing what I plan to do. Just like nowadays, I have a contest to prepare for, and I setup my plan in detail. Just after that my adviser come to me and give me a lot of work to do... Do you always meet with the same situation? Are you used to make plan? Can you always stick to your plan? Do you have any advice to help me with this?