"Last year?" I said. "So you've been thinking about this for a whole year and you didn't tell me"
"We didn't know if you'd even get in, Auggie," answered Mom. "It's a very hard school to get into. There's a whole admissions process. I didn't see the point in telling you and having you get all worked up about it unnecessarily."
"But you're right, Auggie. We should've told you when we found out last month that you got in," said Dad.
"In hindsight," sighed Mom, "yes, I guess."
What does August's mother mean when she says in hindsight?