For the exam:
Chrome is the only supported browser
Be sure you disable plugins that block iframes
Be sure you have your Linux Foundation certification invitation email and know your Linux Foundation account login information
Run the compatibility tool: https://www.examslocal.com/ScheduleExam/Home/CompatibilityCheck. Select “Linux Foundation” as the Exam Sponsor and “CFCD” as the Exam.
Review the Candidate Handbook: https://training.linuxfoundation.org/go/CFCD/CandidateHandbook
Review the Tips: https://training.linuxfoundation.org/go/CFCD/Tips
Review the FAQ: https://training.linuxfoundation.org/go/CFCD/FAQ