Very tough regardless of the trial you're sitting, however you'd probably have a greater chance with a school written paper because i find the questions are more descriptive.
I'm currently booked out for all that have inquired recently.
If you're currently in year 11 and want tutoring for year 12 term 1 and onwards, i'm happy to take unofficial bookings to ensure your desired spot in my schedule.
Advanced.
Even though i went fairly well for standard (87 which is top 5% of the state) i'd still choose advanced if i had the choice again, my atar would be higher.
I would consider trying to learn a real case study instead of putting effort into something like this. A hypothetical case study should really be a last resort and it shouldn't really be something you 'prepare' for.
That's my personal opinion anyway