Man, Mr Kushy, I was so nervous that as soon as I sat down I didn't remember a word that I had said. I was talking at a rate of like 250 words per minute. I timed my speech to be around 4 minutes long speaking in a calm and controlled tone while engaging with the audience. As soon as I got up on stage, oh my gosh, felt like I was experiencing hallucinations from taking drugs lol.
My speech is in three weeks, so I'm really preparing for this one 
Before I start, I do my best to make sure the class is as chill as possible, instead of being all serious from the previous presentation. Things like when everyones talking just after I get ready, I go talk to some of my mates, just say random stuff and even walk around the room a little. The worst thing is doing the presentation, getting the start right and stuff and then after a few slides I'm like "wait, was this on there before?" hahah
I cannot emphasise how important practice and repetition is. My cousin was giving me tips on presentations, he said that his supervisor/professor is one of the best ENT (ear nose throat) specialists in the world. He knows pretty much, almost everything there is to know about ENT and gives presentations about it quite frequently and even he practices.. That's all I needed to be convinced really.
Someone who's built a profound knowledge over their years of research, still finds the necessity to rehearse and practice their presentation, regardless of the fact that they know and understand the material back to front.
I got really dramatic in my speech and at the very end I maintained intense eye contact with the Head of English and said " I challenge you. ( DRAMATIC PAUSE) I CHALLENGE you to stand up for asylum seekers...." XD
I believed what I was saying and I was happy at how I communicated it.
I was nervous, but I guess I channelled that into the message I wanted to project.
Good luck for anyone who hasn't done their oral sac yet. 
These are always the one's that come on top

My teacher told the class that the one thing that each and every one of you have to get over is that when you present, you will have to speak/communicate differently than how you would usually to your audience, that is, your peers. You have to get over the fact that it might be embarrassing to speak formally, or passionately about the topic.
It's a small thing, but I think that it's partially why a lot of people score lower than they should. But is this why some schools make you present to just teachers instead of the class?