I just recently took the CDS 4.0 exam and passed all of the multiple choice sections, however I failed the vignette section with a level 3. I have the practice software and had practice the vignette several times prior to the exam, along with looking at fell test takers posts of their practice vignettes here. With it being a level 3 fail, I am making an assumption that it means I made a fatal mistake with something. I made sure to look for the largest duct/joist combo on each floor to ensure I had accommodated the largest duct height per floor with the joist spacing while still allowing the 8" clearance for the light fixtures. The footings and foundations were placed correctly such as the top of the footing was at the designated frost line depth. The only thing that comes to mind that would have caused me to fail is potentially placing the grade line a couple inches away from the section cut line provided. I'm not sure if that matters, or if you are able to have the grade line placed a couple inches from section. Also, I placed said grade line so it had extended roughly 3 feet beyond the extents of the building, however I am unsure if that was too much or too little to be graded properly. Coach, or anyone else know what the fatal mistakes would possibly be for this vignette? I have spent several hours going through in my mind what mistake I could have made to cause this but nothing seems to pop into mind and I haven't been able to find many posts about what the fatal mistakes could possibly be on this vignette.
Thank you for your time and taking a look at my question in advance!