It is not the only subject of study. Here you will find more training.
And I agree with having a limited number of attempts, after all you must have a minimum knowledge of the product, it would be very easy if it were unlimited. 😉
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.