In Office 365 there are a number of roles available with a myriad of differing levels of access and permissions.
This link on the TechNet site is a huge help, both when deploying and when studying for an exam like I am (on Monday , no less), and these can be set at the users and groups / settings page on Office 365 Admin center page.
Short and sweet but worth remembering how to grant administrative privileges.
Remember those Examination objectives
Will feedback after the exam on Monday (and a full weekend of cramming)