The guidelines for the online exam are quite strict. Read them carefully and prepare properly. Also prepare for being thoroughly checked on following the guidelines before you can start your exam. The big brother effect can be quite daunting if you're not anticipating it.
Yes, you will be asked to turn on you camera. The procurator may also ask you to show your room to make sure you are the only one in the room and may ask for some documents to verify your identity.
Also, please make sure to read the exam guidelines before you appear for the exam.
Here's a blog post I wrote about taking the test remotely https://nation.marketo.com/t5/Champion-Program-Blogs/Champion-Tips-for-Taking-Your-Marketo-Engage-Ce...