What are some of the common Time Management mistakes and how to avoid them?

SMART (Specific, Measurable, Adaptable, Reliable, Time bound) divide work in chunks.
make preferences.
handle the pressure doing it in planned time.
alternatives must be there to if preferred work time elapsed.
make checklists.
Try to be efficient and effective.

From my point of view, the common mistake in time management is the inability to set priorities and putting first things first.

i think that one of the mistake not to consider the flexibility of the plan, which mean manage thr time according to the plan

To avoid mistakes regarding time management, first, jotted down the most need prioritzation, first or two weeks before, manage your time by being prepared and organized so if there is an upcoming deadline or target date, you are ready and 2nd is to avoid panicking and mistakes.
But everybody makes mistakes, nobody is perfect but by proper handling of time, you can manage and organize task or work.

One of the big mistakes at the time management is the miss understand of the meaning of the time management, the biggest step we need to do it at the time management road is to know what is TM and what its mean for us.