Yeah. You'll get an exclamation mark in the mail, and you'll go to your preschool teacher and cry. Then you'll get another exclamation mark, and you'll go to a place with a teacher. You press A to browse through all of them, then press B when you like the one you're on. Hope I helped!!
It will graduate soon, It takes bout' 1 more day (If it just evolved) and if its been 1 day already he should be invite to elamentary school in no time! x]