Make sure you know the topic well, read on it thoroughly and listen to any lectures on it aswell.
Remember to recite:
After that recite:
رَبِّ اشْرَحْ لِي صَدْرِي وَيَسِّرْ لِي أَمْرِي وَاحْلُلْ عُقْدَةً مِنْ لِسَانِي يَفْقَهُوا قَوْلِي
Rabb-ishrah li sadri, wa yassir li ‘amri, Wah-lul ‘uqdatam-min-li-saani, Yaf-qahuu qawlii
O my Lord! Open for me my chest (grant me self-confidence, contentment, and boldness); Ease my task for me; And remove the impediment from my speech, so they may understand what I say [Surah Ta-Ha; 20:25-28]
A du’a that Musa (alayhis salam) made when proceeding to the court of Fir’awn (Pharoah) for the arguments (inviting him to Islam).
Also give an introduction (overview of presentation) at the beginning and make sure to summarise/conclude at the end. If you are confident in the knowledge you have on the topic, inshallah it will be fine.
The timing is also important, time yourself whilst practising. This will give you a rough estimate of how long you'll be up there for (may vary due to nerves when actually presenting).
Alhumdulilah I have found this to really help me and I've delivered presentations to many different audiences. Best of luck!