PrepStudio is an AI powered study platform that turns any topic into a structured, voice-first learning experience. You describe a goal a job role, a certification, an interview and Gemini 2.5 Flash generates a personalised multi-day study plan broken into digestible topics. For each topic, ElevenLabs' "Nova" tutor explains the content aloud in a natural, conversational style. When you're ready to be tested, "Alex", a live AI voice interviewer, asks eight targeted questions and evaluates your answers with a detailed Gemini-scored report. The entire stack runs on Next.js 14 and FastAPI, with Firebase auth and PostgreSQL, deployed on Vercel and a custom backend host. PrepStudio was built for the ElevenLabs Hackathon #9, where voice quality and authentic AI interaction are the central differentiators.