Eliminate any distractions such as noise or visual clutter, and try to find a comfortable, well-lit place to work.
Set achievable goals for each task or activity, and prioritize them based on their importance.
Taking regular breaks can actually help improve your concentration. Try working for 25-30 minutes, and then take a short break before resuming work.
Mindfulness can help improve your ability to focus by training your brain to stay in the present moment.