In terms of the discouraging questions on Edrolo, don't stress, I am like 2 weeks ahead in physics but they still get me sometimes
. The best solution to them is doing a mistake book, makes it much easier to remember. But don't stress, the exam questions will come up but not every question will be like them. Understanding the theory and concepts beyond what the teacher says can help.
Honestly during year 10 I felt the same way for the first half of the year. I think that the only real solution is just to... start the work. I know that sounds kind of obvious but I would always struggle to start work, like you I would read on stuff like study guides, but as soon as I started, I would just work through it. Make sure to get some relax time, find a youtuber or a tv series and spend some time when you get home or later in the evening just chilling. Maybe set aside one day like Friday to just veg out.
In terms of studying ahead... Honestly it is good if you can but you should never prioritize pushing ahead at the cost of understanding. Go at your own speed, make sure to create your OWN revision and do the homework(or at leas the relevant bits) and it will be better than pushing ahead and barely understanding.
TLDR; Make breaks, just sit down and go through HM+ OWN revision notes. Don't get discouraged and ask the teacher for step by step examples if you still don't get it.