@geraldbelton, The exam has been updated a lot in the past few years. The content guide reflects the most current information in regards to what is currently being tested on. I do know that the current certification guide covers information about the PDV and how it works, etc. However, the input buffer information was removed when DATALINES and INFILE/INPUT statements were removed as well.
PDV is still covered in the guide and training, but more as a way to learn about how everything works 🙂
Hope that helps a little bit!