Buy a used physical book and scan it yourself – that's your personal PDF.
Print the free sample papers and make your own "PDF binder." That’s all you really need + a grammar guide (like Grammaire Progressive du Français B1 – buy that one used!). Delf B1 Book Pdf
1️⃣ – Check Français Authentique or TV5MONDE (they offer free downloadable exercises, not full books, but gold). 2️⃣ Sample Papers – The official DELF website has free PDF samples with listening/reading. 3️⃣ Affordable Options – Search for "Préparation à l'oral du DELF B1 PDF" or check sites like Scribd (free trial). Buy a used physical book and scan it