#3u

I have a question... so I'm currently in year 12 and doing 11 units including 3u maths. I'm contemplating dropping ext 1 maths as I believe that 1 extra unit wouldn't really benefit my atar... my performance in this subject is quite average, and I'm lacking the motivation to study for it...

what are some of the best trial past papers to do for 3u maths? (not necessarily the hardest, but a good representation of the hsc)