I just made my cheer team and need tips.?

Do you know anyway to improve my jump? I'm pretty flexible but when it comes to doing a straddle on the floor. But,doing toe touch it is rather hard for me to do. I just made my middle school cheer team and I almost didn't make it because of my toe touch. My arms tend to go behind me and I can hardly do a straddle in the air it is very sloppy and I can never land right. Do you know any skills or little things I could do to improve before game season? I also need to know what waxes I can use to make my armpits look more clean and non aftershavy. Thank You in advance.