This turnkey Amazon KDP publishing portfolio operates in the evergreen test prep and professional certification niche, where learners and professionals reliably purchase required study resources regardless of economic conditions, and it includes 10 highly targeted educational guides that generated $23,257.66 in royalties over nine months (July 25, 2025 to April 27, 2026) using a data-backed, optimized ad spend of $9,927.20, with the launch work, algorithm training, and PPC optimization already completed to support a scalable, recession-resilient income stream. Key Highlights ✅ Evergreen test prep and certification niche with consistent buyer demand ✅ Portfolio includes 10 targeted educational guides ✅ $23,257.66 in royalties generated in 9 months (July 25, 2025 to April 27, 2026) ✅ $9,927.20 in optimized, data-backed ad spend ✅ Launching, algorithm training, and PPC optimization already completed ✅ Built to be resilient to trends, social algorithm shifts, and broader downturns