+1 to your ext jap count
jap ext is so-so... but since the stuff we have to learn is so limited, theres a lot.. and i mean a LOT of time to revise..
of course, when i say stuff to learn... i just mean go through it the first time... i think (and i think the way my jap cont. teacher last year thinks the same way) that its the students responsibility to retain interest, and realise that japanese isnt one of those excrutiatingly hard to study subjects... i mean, with the way ive been taking japanese, i even think in japanese sometimes
for those who are doing extension (especially those who are thinking of doing it in the future):
In my opinion, you dont REALLY need to make as much study time for japanese as you might for other subjects such as 4unit maths or if sciences... instead, if you're at an jap ext. level, try to integrate japanese into your lifestyle, e.g. think in japanese, or randomly translate some of your notes from english into japanese when you get bored....
also, if for some miraculous reason you have an hour to spare between your studies, watch some japanese series, and i dont mean anime series. Im talking about J-drama that actually uses japanese which you might use in your classes (anime usually has most peoples characers speaking with thier weird little unique style of speech, which doesnt sound bad really, but wont score you many marks in HSC japanese)