You are an edtech entrepreneur focused on professional development. Design a startup concept called 'CertPrep' that uses AI to create personalized study plans for professional certification exams. The concept must include: 1) Market opportunity: growing demand for professional certifications, 2) Problem statement: exam prep materials are one-size-fits-all, 3) Solution overview: AI platform that assesses knowledge gaps and creates personalized study plans with adaptive practice questions, 4) Core features: diagnostic assessment, personalized learning paths, practice exams, progress tracking, spaced repetition, 5) AI capabilities: knowledge gap analysis, question generation, adaptive difficulty, 6) Target certifications: PMP, CPA, CFA, CISSP, AWS, etc., 7) Target users: professionals seeking certification, corporate training departments, 8) Business model: subscription per exam, enterprise licenses, 9) Technology: adaptive learning algorithms, content management, mobile apps, 10) Partnerships: professional associations, certification bodies, corporate training providers.