Ahh, I just realised how complicated my school's timetable is. Finishing times, as well as period time and length, vary according to the day.
Yeah same, we have a Friday Timetable in which 5 mins get chopped off of periods 1-4 (thus changing the time of recess as well) and tacking it on to the end of period 4 so you could have a 20 minute house/year level meeting. However, Friday timetable usually ran on a wednesday to create a super 80min period 4 so you could have normal assembly and house debating (or general house meeting crap) or whatever.
Anyway, if you were in years 10-12, this is how it'd look:
8:35-8:45 - Tutor (time they mark off the roll)
8:45-9:45 - period 1
9:45 - 10:45 - period 2
10:45 - 11:10 - recess
11:10-12:15 - period 3
12:15 - 1:20 - period 4
If it was monday, the day stops here
1:20-2:10 - lunch
2:10-3:15 - period 5
If (day == "friday") Day ends here
Else if (day == "wednesday")
3:15 - 4:20 - period 6
Else if (day == "tuesday" or "thursday")
3:15 - usually 4:45 but if you chose sports which involved bussing out this could be 5:30 or worse - sport, joy of my life
In either about year 10 or 11 I worked out that trying various friendship groups within my year level didn't work and I lived in the library instead during recess/lunch. This was infinitely more enjoyable (except in year 12, when all your friends are younger than you because those in higher year levels have now gone

). The head of the library was very nice and we got along and I helped put away stuff for her in the morning before school. The 2nd in charge tended to kick me out when she was on duty xD
I never saw people from my year level outside of school. They weren't friends. Going out with fsn people to karaoke and bowling has made me incredibly happy

And classes:
English - annoying due to the greater mix of people (zomg, non maths/science kids there) (I just don't get along with them as much) but otherwise good
Physics + Chem - grouped as they are very similar (course too easy, teachers were great, loved helping people do questions, was the place I could feel like being myself the most (although this was still repressed a bit, but I *did* love the science cluster))
Maths - Less fun than physics + chem due to tighter adherence to traditional teaching styles (couldn't wander around the room as much, talk as much etc when doing questions) but otherwise great due to it being 10x more challenging than science
Chinese - If there is one teacher at my school who is definitely doing the right job, its her. Heart of gold + not 1 person in the school disliked her. Good fun there
And IT in year 11 - The number of jokes we did in there was great =D again awesome teacher, could get away with doing stuff, generally A++++++ environment