I was away for the first 2 weeks, so I've only got to attend 7 days so far, but I'm mostly caught up. I've had a maths and engineering test so far, and I've got 2 assignments. The only thing I found somewhat challenging was engineering because I don't think I have ever done mechanics ever up until now.
I think the only people finding prelims hard are the people who have forgotten everything from last year. (idk how because it was all simple and easy)
Yeah don't worry about year 11. In hindsight, I stressed way more than needed in year 11 and for me it's just a year that prepares you for the HSC workload. Don't stress!, it is more of an introductory year and it just helps with your understanding of what will happen next year. Teachers make it out to be way more than it really is. That being said don't forget to actually do the work because that's all apart of school and the learning experience