Hello,
Just wanted to finished this thread for anyone thinking about doing Beginners or Continuers Japanese. I chose Continuers Japanese in the end and I can tell you that it wasn't easy for the first 6 weeks. I literally felt like the most stupid person in the grade and most of the grammar did not make sense. That being said, I really put everything into the subject, alongside doing distance education for Korean Beginners and I can tell you that unless you can learn at a really quick pace and are ready to continuously get every sentence you write edited, don't even think about it. I literally wanted to drop Japanese really bad until I suddenly understood everything just before my first assessment. But yeah, in the end I'm doing Japanese Extension now and you cannot even tell I didn't study it in Years 9 and 10. So in the end its up to you!
Good Luck!