After clearing the vault and landing in control, it's common to land sideways (parallel to the bar) when doing the front fall. If possible (you'll have to clarify with your test administrator), try facing forward when performing your front falls, rather than sideways. That way...
There's a misconception that you need to use your arms to push yourself up and over the bar when it comes to the vault jump. I can see that point of view, but it's not the most effective way of going over the bar. When jumping...
The 3 foot vault poses a problem for many people. On video it doesn't look like much. It doesn't sound like much either when you hear 3 feet. But when seen in person, it looks anything but easy. People start conjuring up images of things going wrong...