during the labs for do288vc-4.6 a personal github and quay.io account was needed to be able to complete the labs. Do we need these accounts during the exam ? What about the credentials for these accounts ?
As @NirZilka says, everything that you need to complete the exam, software-wise, will be available to you during the exam. The exam does not rely on your personal accounts.
However, during the training, we do use your personal GitHub, Quay, and other accounts, because we believe that's how you get real-world experience with the services (and the accounts are free).