Another tip, prepare your presentation on paper using a spider diagram, central theme in the middle, sub-topics adding legs, add extra spiders on spiders as req

Another tip, prepare your presentation on paper using a spider diagram, central theme in the middle, sub-topics adding legs, add extra spiders on spiders as required. You can make something like this very quickly (less than 30 minutes) especially when you know your subject it's a handy cue for the key topics. It can be used to help prepare a PowerPoint however stick to the recommondations on here and in the link.