Planning a day well is less about filling every minute and more about deciding your few important things in advance so you are not drifting. A day with no plan tends to get eaten by small distractions, and by evening you feel busy but empty handed.
Start the night before or first thing in the morning by writing down your top three tasks for the day, the ones that truly matter. Everything else is secondary. Then give those tasks rough time slots rather than a vague hope of getting to them. Attaching a task to a time, like maths from 5 to 6, makes it far more likely to happen than just having it on a list. Keep some empty buffer time too, because days never go exactly to plan, and a schedule with no gaps breaks the moment one thing runs late.
Match tasks to your energy. Put your hardest, most important work in the hours when you focus best, and leave easy tasks like organising notes for low energy times. Include breaks, meals, and some rest on purpose, because a plan that ignores rest is a plan you will abandon. At the end of the day, take two minutes to see what worked and adjust tomorrow. Over time this small habit of planning and reviewing builds a rhythm that makes productive days feel normal rather than rare.
Example: A simple plan might be: top three tasks written down, each given a time slot, hardest one placed in your sharpest hours, with breaks and buffer time built in.
One practical tip: Limit yourself to three main tasks a day. A short list you finish beats a long list that leaves you feeling behind every evening.