Are They Still In The Same Grade?

In the Oasis season, I am pretty sure that I saw D.W. and etc. at the same preschool with Ms. Morgan. Wouldn't they be in Kindergarten? In "The Last Day" everybody finally advanced to the next grade.

I wasn't sure because of the different animation studio seemed to make changes to she show such as adding Ladonna and Bud. It happened the same time and it gives the impression that the show was going through different changes. Perhaps they were running out of ideas and decided to Add new characters and then advance everybody to the next grade. No need to have a long rant about Status Quo.

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 = 

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