Moving from Aus to NZ in High School!

I'm currently based in Melbourne, Australia. I'm currently completing Year 11 here, but once I have completed Year 11 I plan to move back to Dunedin, NZ as that's where I'm originally from. The New Zealand equivalent to Year 11 is apparently Year 12 which means next year I should be in Year 13. Although I'm unsure if they will make me complete  Years 11 & 12 or if they will put me into Year 13. Could anyone please shed some light on this?

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