You're given a grade for presentation - to be clear, this is not and will never be an assessment of your ability to speak in public! The most important part of 'presentation' is your FMP website, so take care with design and layout. You also present your ideas twice, once at the initial pitch stage and then again at the end of the process. You don't have to talk, you could make a film or slide show, you could even get an actor or an avatar to present the work for you... the point is to show your assessors that you are confident about your ideas and able to articulate your vision and reflect honestly on your strengths and weaknesses...