All the inaccurate tardy slips out there always bothered me and so I thought, I make my own more screen accurate version. There's no clean shot of the slip in the movie, so this is my best guess.
By the way: This is James Tolkan's original handwriting.
US-Letter version: http://www.zubcic.com/pdf/Marty_McFly_Students_Admit_Slip_remade_by_Roland_Zubcic_US-Letter.pdf
International A4 version: http://www.zubcic.com/pdf/Marty_McFly_Students_Admit_Slip_remade_by_Roland_Zubcic_A4.pdf
Preview pics:
By the way: This is James Tolkan's original handwriting.
US-Letter version: http://www.zubcic.com/pdf/Marty_McFly_Students_Admit_Slip_remade_by_Roland_Zubcic_US-Letter.pdf
International A4 version: http://www.zubcic.com/pdf/Marty_McFly_Students_Admit_Slip_remade_by_Roland_Zubcic_A4.pdf
Preview pics: