Of course it's fine to have days off. I would never see myself being able to study everyday. Your body and mind need some down time. Go out, play sport, partake in your hobbies. Even if it's only a 'partial-day' per week as dan said; it is fine. Personally, I just had breaks if I felt I wasn't working well/got bored/wanted to have a life.
Days off here and there aren't going to mean the end of the world
I actually think a break (obviously realistically a whole day may be a bit much), is good once a week; to ensure you
(1) don't go insane
(2) don't burn out.
(3) when you get to the end of HSC, you actually would have some passions in life
For me, I rarely studied on Friday nights, and neither for Sunday evenings/nights.
Wherever necessary - do
- Extremely ill
- Important family situation etc.
- Sport representative
A little cold counts as unnecessary. Getting a severe case of the flu to where you constantly have runny noses and headaches counts as a necessary. (Heck, if it were that bad, get a doctor's certificate if you had an exam that day)