1st presentation for Communication Skill

Last Tuesday, we were having our 1st presentation for Communication Skill module. Frankly, it was my 1st presentation which requires me to put on formal clothes. According to what my tutor says, this assignment covers 50%. To me, it is really a tough job. 50% marks, how am i going to handle it?? I'm quite care about the marks as this marks will be counted for GPA. As for scholars, we need to obtain at least GPA 3.60.....So, i had tried my very best and put in alot of efforts in my presentation in order to get good marks. I practised everyday to improve my vocal, my pronunciation, my posture, hand gesture, eye contact and all sorts of presentation skills week before the presentation... Indeed, i was told that i present quite well that day and that made me really happy. What i hope is, with this experience, I can do better in the future.