At our gym the girls don't know for sure what level they are competing until they are taught routines. Most people speculate based on summer training groups, but it's still very much up in the air until the very end. And then there's no official notification. Just one day my dd came home and told me she learned the level 4 beam routine. That's how we found out.
I wish our gym would do it this way. We move up in May but don't compete until the end of October. A lot can change in almost half a year!