This is what you can achieve if you apply yourself.
My "L1"
Me and a guy I worked with, both took these as a bet, we both passed, no one won the bet.
This one got wet, had a leak in the shop.
I took all these at the same time, didn't make sense to have the L1 without taking the rest.
When I re-certified, I took all the tests the same night, including the Service Consultant test, it was a long night.
Service advisor certificate, took it for fun.
I never re-certified after these all expired, don't ask me why, mostly didn't want the inconvenience, didn't want to sit in a hard chair for hours either.