Thanks for your reply @CN-L, I haven't found the chance to purchase it.. it seems to be in demo version now and to be enabled later this year - see this: Official practice exams with MeasureUp FAQs 

EDIT: purchase can be done here: https://www.measureup.com/servicenow.html 

But regarding the experience with the 5 demo questions, I liked the options to set your preferences whether you want to see the answers or not etc: