Well, it depends on how you define hard, a lot of factors can influence your perception on whether year 12 is/was challenging or not. From my personal experience, I'd say it required me to put a decent amount of effort, and of course there were times where stress, exams, assignments, fearing not get a 99 Atar, etc,... really overwhelmed me but I think what kept me going was that I really enjoyed the subjects I did and had a bit of support from those around me, so overall I'd say it was challenging at times but looking back at it now, I think it was definitely a fun experience.