How did find the most effective of you?

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Everybody also has different effectiveness in different situation, environment and also period. I am always finding my most effective time to complete the tough job or assignment. Unfortunately, I always fail to find my prime time during the day and I am always procrastinate. I wasn't know how should I manage myself. My prime time is in early in the morning. But I always fail to wake up early. Wake up early is so suffering for me. How did find the most effective of you? How did you manage your time? Thanks