Hey there, @Anonymous.
I hope you're having a great week so far. The reason why you're not able to find the PDF Supplements for these modules is that they were removed last year. I can see how helpful those links would've been to have for your business. However, this link can provide you with some additional information about acing the QuickBooks Online Certification exam.
Let me know if this helps. If you need anything else, don't hesitate to contact me. I'm always here to lend a helping hand. Take care!
