Wear formal business attire. You should begin to get accustomed to doing so. Men should wear suits and ties. Women, skirts or business attire. Think of this as a dress rehearsal prior to your first job.
Oral communications is different from written reports.
Do Not Read your report. Written communications is more formal, grammatically correct. Oral communications, by way of contrast, is more free and loose. Any notes you have for your presentation should not be phrased word for word but with main thoughts only. Reading comes across as stuffy and inappropriate.