Ashleigh; why didn't you apply for NIDA or VCA? As a current VCA student, I can tell you that most of us come straight out of school with a background just like yours.
As for the gap year; shadowing can be a great way to see some really exciting stuff. E-mail SMs - they are often very generous about letting you join them in the shadows for a night. I did this for a certain commerical musical earlier this year; I went out on a limb and e-mailed the SM, a guy who I had heard lots about but never met. He was lovely and his team were delighted to show me around their show for a night.
I'd look at doing some casual crewing. The Entertainment Store are always looking for people like you to do bump-ins and outs and the kind of people they attract means you can end up meeting a lot of cool SMs/LDs/tech/PMs. Message me if you want their details. It's not Wicked, but they pay and you'll meet people. You'll also have a few companies like Lock & Load, Show Support, Staging Connections, etc. - all of these places are often looking for crew and again, it can give you a chance to make some money in the industry whilst also getting to see some very cool shows from a very different perspective. You learn a lot about a show when you bump it out!
I'm not sure if it's the same for the NSW State Schools Spectacular, but the Victorian one takes on interns like nothing else. Look into it; it's a great chance to work with top-notch professionals on a huuuuge project (especially if you like working with kids), and will carry some serious weight on a NIDA/WAAPA/VCA application. Sadly no pay, but if the NSW one is like the Vic one, you get enough joy out of it to last a year.
I'll message you