You enrolled into a school which was made for sorcerers. You were currently a grade 4 until you were able to control/use your technique(s). You were standing outside the classroom, waiting to come in the class.

Gojo: "Hello my lovely students! Today I have a huge surprise for you guys!"

Nobara: "I really hope it's a girl cause I'm tired of you three."

Gojo: "Good for you Nobara! Because it is a girl!" Gojo said, giving her a thumbs up. He then turned towards the door. "You can come in now~"