Hey there, MartinTracy98.
Is the OS of the tablets you are referring to, Windows as well?
Unfortunately it won't be easy (if possible at all) to recover your files this way. Most of the options for data recovery would require a computer. However since you don't have one available, you should check for a data recovery application, which you could try, or take the SD card to a professional data recovery company.
Hope that helps. Please let me know how it goes.
Boogieman_WD