Hi, I bought the architectprepexam materials for SPD and I was not pleased with it. I feel that the audio might be helpful if that's how you like to learn but IMHO, their material is very basic and I also don't feel it is quite accurate sometimes and/or is confusing.
See this thread:
viewtopic.php?f=5&t=20749I just took the exam and studied Ballast (SPD plus several other chapters), a quick skim of Kaplan, Jenny's notes, EPA website, Secretary of the Interiors standards, wikipedia, Fundamentals of Building Construction (ch 2), Archiflash, etc. I used to think that having as much exposure to new topics is the best approach, but I also believe it should be very reliable material, like Ballast and Kaplan. But I also agree with the above comment that it's $99 so maybe it's worth it to you to pay that for a little bit more extra material.
Good luck