Give yourself time to practice your presentation in front of an audience before the big day. Familiarize them with the assignment guidelines, as needed, and ask them to time you. You'll need to know if your presentation meets the time requirements. After the first run though, consider these questions:
Use your answers to these questions to determine what, if at all, you need to change and then schedule another practice. You should practice your presentation as many times as you need to in order to achieve a fluid delivery.
Delivering Presentations
Algonquin College Library hosts an informative guide about delivering presentations.