I have just left the school. Behaviour in this school is wild, the children are out of control. The worst yr group however will be the new grade 8 boys, they are vile, disrespectful and spoilt. I really hope you don't get that year group for science! I think you should ask the school!
The timetable is probably one of the positive aspects of the school, you will get a few free periods in the day to re energise, recover, sleep, mark, etc (don't let them catch you sleeping).
I have mentioned this before, the staff teaching staff at the school are awesome and one of the best groups of people I have worked with. We created a "we are all I'n this together " atmosphere cus literally the kids, administration and parents will be against you and u will not receive any support! Morale , smiles and general enjoyment is rare I'm afraid. Look elsewhere , you've still got time!