This song will use an open A chord, and then a variation. For this variation, you lift
your pointer finger off of the string and play the rest of the chord. Easy enough. 
I'll refer to the variation as "Av"

You use:

A, A, Av, Av As the intro, and for the whole first verse.

The pre chorus is: 
Bb                   E
But, just a little different ooh...

Then the chorus:
A,     Av, Bb,    E           A, Av,       
Special Ed, Momma dropped him, on his head,
Bb,     E,     A,      Av,   Bb,    E,        A, Av.....
Now he's not so bright, instead, he's a little bit special...

F#                 
One day talkin to special ed 
A(