1) Usually I'll be outside (or roaming around inside with friends) but if there's a SAC coming up in the periods after recess / lunch, I'll be studying in the library (bit of a last minute guy, haha).
But I think for this year, I'll be mostly outside because I think it would be better to enjoy some time off work and hang out with friends - especially in Year 12 - and not get burnt out.
2) I'm awful at keeping away from FB. Working on it. Limiting use is usually my go-to, studying away from the computer / phone is also helpful.
3) History says that timetables don't work for me. I've always found them unhelpful and too rigid and put off things that have been timetabled. Of course, timetables could work for you.
I structure my time more loosely so I'm not too hard on myself if I don't do things according to plan. (For this year: HW completed in free periods (if I'm not sleeping in them), dinner, then study usually after, downtime from 9 etc. etc.) I also work by checklists because of that feeling of accomplishment after I tick all those tasks ferociously.