Several Android photo apps may help with basic editing on a tablet, including Photoshop for Android, Pixlr by Autodesk, and Aviary Photo Editor. From the suggestions given, Pixlr and Aviary are presented as free, while Photoshop is a paid option.

For your needs, the most relevant feature to verify is photo rating with 1–5 stars, because not every mobile editor includes a true star-based culling workflow like Aperture or Lightroom. Basic editing such as straightening or horizon adjustment is commonly available in photo editors, so apps like Photoshop, Pixlr, or Aviary are reasonable places to start.

Retrica was also suggested, but it is more focused on effects, so it may be less suitable if your priority is organizing and rating images.

In short: try Pixlr, Aviary Photo Editor, or Photoshop for Android for editing, but check each app’s library/organizing features first to confirm whether it supports 1–5 star ratings in the way you want.