I didn't do great in comparison on BC and I thought they were very hard. But, on the official, I was pleasently surprised with how easy they were. The ones I got could be worked through pretty simply with basic algebra skills. The ones on BC I had no idea how to improve. I had zero trig and zero geometry on my test other than maybe some really basic geometry applications you should know.
I'd say youre heading for close to a 30 with those scores on QR, BC was way harder than the official. Good luck!