Cribba is an application for iPhone, iPad and iPod touch, that can significantly improve your efficiency on exams.
Cribba is easy to use:
1) Open your educational materials in Cribba. It opens images and PDF
(you can easy convert other file formats to PDF with third-party applications and tools).
2) Form the crib, selecting main theses using one finger.
3) Use this cribs as you wish (before the exam or on the exam).
Cribba allows you edit your cribs by scaling, adding and replacing pieces.
Cribba provides a navigation in your cribs via categories, folders, shortcuts and icons.
To get the educational materials, you can use iTunes File Sharing.
Furthermore, Cribba supports cloud services: Dropbox, Box and Google Drive.