Oh I will definitely gatekeep my trial papers from everyone, especially since everyone in my grade is watching my every move to see how I do so well at school. I plan on emailing it to my teachers or meeting up with them privately.
Seems like a plan! Another thing I'll update you on when the time comes!
With Mathematics Advanced, I did a trial paper every day or every second day. Teachers should understand that your accelerated subject is your priority and worst case, express that to them and reassure them that you will catch up soon after.
I didn't have to go to school the day before the exam, since that was procedure. Not sure about you though.