Previously the Intermediate exam was an Open book exam but it is not anymore. You can't have another screen open during the examination. Make sure to follow all the learning paths before you take the exam!
To add to Sjoerd's answer, if you scroll down on this page, you can read all the information about the exam, such as prerequisites, allowed resources, etc.
The type of questions you get during the exam are in a similar format to knowledge checks covered by Academy learning paths, multiple-choice questions.