Parkinson's Law: work expands to fill the time available. Give yourself a full day for one exam paper and you'll drift through it. Give yourself 40 minutes and most people finish. A countdown turns "study for a while" into "finish this in X minutes" — the task gains a finish line, and procrastination loses its hiding spot.
25 minutes of focus plus a 5-minute break equals one Pomodoro. After four Pomodoros, take a longer 15–30 minute break. The rhythm works for most people for three reasons:
If 25 minutes feels too short, switch to 50 minutes of focus with a 10-minute break. The exact number matters less than one rule: focus time and break time must stay separate.
Exams are where countdown timers earn their keep. Spend the first two minutes scanning the paper, convert total marks into seconds per mark, then allocate time per question by its weight. Reserve 10% for review — ten minutes on a 100-minute exam. Keep the timer in your peripheral vision so you're not checking your watch every few minutes.
📚 Daily review: after 3–4 Pomodoros, take 20 minutes away from the desk
📝 Practice problems: 50 minutes solving, 10 minutes checking and logging mistakes
📖 Memorization: 25-minute rounds with recall testing beats re-reading
🌙 Final week: run full-length mock exams against a real countdown to train pacing