Unfortunately, we're not allowed to discuss what was specifically on or not on the PCAT. I think that's why you haven't gotten an answer yet.
I think your best bet is going to be to look at a math text & work some problems or try googling "vector math" & find a site that works for you. The second method is what I like to do, since some of my texts went missing in the last move... I think they hopped in my boyfriend's car and took a ride to Bookman's. 🙄