Printing on to a cassette tape

Hi guys

I have a A4 sheets of x12 audio cassette stickers. The question is how do I print onto these? each sticker on the sheets need to be the same. I have gone to word - mailings method, however when it prints it is upside down as well as not duplicated to each sticker on the sheet of 12.

Please - I have a deadline for University project and they need to be done asap.

Many thanks for reading.

Ian