I came up with an idea,
1 star = Beginner.
2 star = Easy.
3 star = Experienced.
4 star = Hard.
5 star = Expert (harder than 4 star).
If you complete the certifications you rank up in lvl.
You start at lvl 1star, then when it’s completed you can do it again but harder (2star).
Last lvl is 5 star.