I'm 100% sure of these chords, my mom used to play it for competitions in school and 
is how she taught it to us

   G                        A
     Those school girl days
                C                          G
     of telling tales and biting nails are gone
   G                A
     But in my mind
                 C                         G
     I know they will, will still live on and on

     F#m                 Bm
         But how do you thank someone
                 F#m                        Bm
         who has taken you from crayons to perfume
       A          D             A      E
         It isn't easy but I'll try....

            A
     If you wanted the sky
         C                       A
     I'd write across the sky in letters
                C                    A
     that would soar a thousand feet high
        D         E      (riff)
     To Sir, With Love


     G                     A
        The time has come
                 C                             G
     for closing books and long last looks must end
     G               A
     And as I leave
                 C                     G
     I know that I am leaving my best friend

     F#m                        Bm
        A friend who taught me right from wrong
            F#m                              Bm
        and weak from strong, that's a lot to learn
        A                D             A       E
        What! what can I give you in return

            A
     If you wanted the moon
     C                               A
     I would try to make a start But I
           C                         A
     would rather you let me give my heart
        D         E      (riff)
     To Sir, With Love

     G                        A
        Those awkward years
                    C                     G
        have hurried by why did they fly away
     G                 A
        Why is it Sir
                      C                    G
        children grow up to be people some day

     F#m                          Bm
        What takes the place of climbing trees
             F#m                         Bm
        and dirty knees in the world outside
     A                D             A     E
        What is there for you I can buy

            A
     If you wanted the world
            C                        A
     I'd surround it with a wall I'd scrawl
           C                           A
     These words with letters ten feet tall
        D         E      (riff)
     To Sir, With Love