Start with the output
An essay, a prototype and a performance need different kinds of preparation. Pick a format you want to practice, then read the judging criteria and submission requirements before committing.
Read the rules for this edition
Check age groups, individual or team entry, country restrictions, fees and deadlines. Review originality and AI rules directly with the organizer; permissions differ between competitions and can change.
Plan for learning as well as submitting
Work back from the official deadline and leave time for revision. Decide what you want to learn or finish even if you do not win. A manageable project is easier to carry through than an overloaded calendar.