WAG Tips on skills

[flipping.out]

So I am in Xcel Gold, and I had my first meet in a while due to injuries this past Saturday. I did pretty good at my meet, but some of my skills need some work. My chest is always down in a lot of my skills, like my vault and my front tuck. I am twisting too early into my half-on vault, and my chest is down. My hips also pike and I go up, but then dive down in my front tuck. I have been doing front tucks over tall mats to get my chest up, but it is still kind of low. Any tips? Also this is kind of not related, but does anyone have tips to feel more confident and ready for a meet? I don't know why, but I am feeling kind of down and not confident in myself and I have a meet next weekend. Thank you1