The Scrum Open assessment is available for free to anyone interested in testing their knowledge of Scrum. The Scrum Open assessment is also a useful tool for those preparing to take the Professional Scrum Master I assessment for certification. Before attempting the assessment it is highly recommended that you review the Scrum Guide at Scrum.org.
The assessment consists of 30 questions randomly selected from a larger pool. The average score on this assessment is 74%.
if you are interested in scrum my recommendation is really to try it out.
You can see where you are and as well to figure out some interesting details about the framework