Well if you are doing SOR 2 unit like me and then you are in the exact same boat I was in about a week ago. After little contemplation I droped IPT, I was doubtful for a little while but now I am pritty sure I made the right choice.
It depends whether you like computers or you like writing and researching. i love computers...hence I'm doing IPT. I suck at writing so obviously i would naturally pick IPT. just go with what ur strenghs are!
WHO CARES about scaling!
You will do well in something you enjoy but how are you going in both of them?
Personally, out of the 2 courses I would drop ipt i might be a bit biased but i reckon Ancient is going to be heaps interesting in Yr 12 and it will help you with your other subjects like for example English, it would help you with essay writing and etc..