Hey,
Edrolo is definitely an amazing resource!!! My friends did a unit 3/4 in year 11 and their teacher was able to convince our school/ principal to give it a shot for their Year 12 class. And I've heard only great things about it from then on. So we researched if it was possible to get it individually (as our school won't be getting it next year
). The answer is no. You can't get it individually but can for a class. But your school needs to buy it. That doesn't mean the students don't pay for it. The program costs for one subject divided by students in your class will give you how much one student will have to pay.
If your school wants they can get a Demo on request for free. We did get a demo for all our Year 11 subjects and I actually loved it. I think the demo lasts for about a month. I encourage you to talk to your class teacher and at least try it out.
Hope that helps,
Cheers