Are there any cheerleading tips you could give me?

ok so high school tryouts are coming up next week and im scared to death that im not gonna make it. ive been taking cheer cles at my local gym but im scared about the dance we have to do. we only have one or two days to learn the dance and perfect our cheers sidelines and the dreadful dance. hears what im good at just to try to help a bit, my left herkie is great but the right herkie isn't the best. my pike is excellent. but i don't know how to really project my voice. i want to make sure my motions are sharp so i need something that could help me remember to keep em sharp. also im not the best person when it comes to tumbling but my friends sister who's a current cheerleader said you'll get more points if you can do a back-bend and come up by your self so i need help with that also. if you have anything that would help me please tell down in the answer forum. i really need help. thanks for your time.