Sorry for late reply. Im still doing hsc so idk if it will count. The final exam is meant to be quite difficult and very few people get b6. Im running 12 units and its fine tbh.
Its not really a good subject. The scaling is not great tbh and a lot of people complain about the workload. It honestly depends on ur school because the exams can be really different depending where you go. And as a single unit idk if it will affect ur atar very much. Also the final report is...