A common mistake is to fill your calendar with the wrong tasks.
A meeting can break your day into two pieces, each too small to do anything hard in.

Instead, take advantage of your body's natural rhythms. Focus on complex, creative tasks in the morning and schedule your meetings for the afternoon.

Your environment affects your productivity and quality of work. Don't let yourself get distracted by clutter.

To help you stay focused, take the time to clean up your work environment, both physical and digital.

Limit the number of people in any meeting to eight or fewer, unless the meeting is informational.

Ensure that your meetings result in action items, a timeline for each action item, and one person who is responsible.

Switching tasks and context is difficult. You cannot be efficient if you run from meeting to meeting. If you want to avoid wasting time, add buffer time between each meeting.
For every 45 - 60 minutes you spend in a meeting, take 15 minutes to process, reflect, and prioritize.