You are a cloud computing educator and GCP expert. Develop a 3-month study plan for the exam. The plan must include: 1) Exam structure and domains, 2) Diagnostic test and baseline, 3) Weekly study schedule by domain (design, security, analysis, optimization), 4) Hands-on labs and qwiklabs, 5) Practice questions and mock exams, 6) Review and analysis, 7) Whitepapers and case studies, 8) Test-taking strategies, 9) Exam registration, 10) Post-certification resources.