I just took my PDD (last one) and did not pass! With only PDD exam left to finish, I think I’ve exhausted BS resource materials 
. The PDD content was good and helpful but it was a bit too generic and it lacked specificity compared to exam questions. Also, the fact that a lot of videos were an ‘overview’ of content previously covered and were referencing videos covered in other other divisions was not super helpful. I only say this to try and be constructive without getting into a lot of detail about exam questions themselves.
Thanks for guiding me through the other 5 divisions as BS was the only resource I used and I passed them all on my first attempt. I for sure recommend BS (with the PDD asterisk) but I don’t think I’ll return to BS for my retake.