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31 Days Before Your CompTIA A Certification Exam 31 Days Before Your CompTIA A Certification Exam offers you a friendly, practical way to understand the A certification process, commit to taking the A 220-901 and 220-902 exams, and finish your preparation using a variety of Primary and Supplemental study resources. The 900 series A exams test knowledge and skills needed to manage and troubleshoot desktop, laptop, and mobile hardware and networking technologies; install, use, and troubleshoot Windows, Linux, and OS X; utilize virtualization, strengthen security, and work effectively as an IT technician. Sign up for the exam and use this book's day-by-day guide and checklist to organize, prepare, and review. Each day in this guide breaks down an exam topic into a manageable bit of information to review using short summaries.