Please guide me how to remain focused on studies with concentration and how to manage time?

1- Recite Tasbih al-Zahra for about 10-15 minutes after the morning prayer. It helps a lot.

2- Create a daily planner and plan every hour of your day, and do your best to stick to the schedule. Creating an actual planner helps a lot.

3- Remind yourself that we only have one life to live. We are not given a second chance once we depart this life, so make the best of it.

4- When you eat, don’t eat to the point where you are fully full. Eating too much negatively impacts concentration.