The beginning of the end or the end of the beginning ?

If you look at grade 12 as being the end, than tomorrow is officially the beginning of the end. But if you look at the past 15 years of schooling as the beginning, than tomorrow is like the start to the end of the beginning. If you read that enough times, I think you'll figure out what I'm trying to say. I don't know how else to word it.

If you count pre-school and kindergarten, we've been going to school since we were 3 years old. And honestly, I've been really good at it. Really good at going to school. But I wonder, and I worry, if maybe it's the only thing I know how to do.