Here are the current best PDF resources available for self-learners.
Resource: "Beginner’s Pashto" (CD version converted to PDF – from Hippocrene Books)
Format: Scanned PDF + answer key
Why it’s useful:
Resource: "A Reference Grammar of Pashto" by Herbert Penzl (reprint)
Format: PDF scan (University of California archives)
Why for advanced learners: