Just wanted to post I passed building systems on the second attempt.
What really helped me the second time around is Black Spectacles' FREE youtube videos, as it almost feels like you are sitting in a class, with someone explaining why answers are correct/incorrect.
Also as a base I studied Kaplan, PPI, Jenny's notes, and this forum of course.
One exam (Structures) left to go.. I finally see the light at the end of the tunnel!