Hi @rigelguzman
I think in this case you may rather go for segments than calculated metrics and filter it in combination with unique visitors in your dashboard.
So, imagine this setup for "Level1 Graded" with some actual event definitions of mine
- Event Registrations == "Activity Level1"
- File Downloads == "Activity Level2"
- Internal Searches == "Activity Level3"

You can build up something like this in your workspace

or create a calculated metric using the segment to use it directly


Side note: it seems to me - please correct me if I am wrong - that the segments are not mutually exclusive, correct?
Like with "First Time Visits" and "Return Visits", a user can over time be listed in both, if the time frame is big enough, thus the sum of Level 2 graded Unique Visitors + Level 3 Graded Unique Visitors will be greater than the actual number of Unique Visitors
Cheers from Switzerland!