ebook reader SDK

Our company Firstman Education Pvt Ltd is a education service provider which already has its own application and website.
Application : Coco test series
Website : http://competitioncommunity.com/

Our main concern is to get user friendly e-book reader software development kit(SDK) in our application and website that should run in android , iOS and website as well so that user can feel Realtime experience when they use our software.
We basically want a whole package that user should use without facing any issue. We also have a developer team to integrate this SDK which has the following requirements as already mentioned in the previous mail.

1.Addition of bookmarks.
2. Annotations(text highlighting)
2. Full text search.
3. PDF downloading facility
4. Flipbook(Page Curl Effect)
5. SDK should run in both android and iOS mobile platforms and websites as well.
6. SDK should support various reading formats including PDF, epub2 and epub3.
7. SDK should act as a google playbook interface and provide facility for the same(mandatory).
8. SDK should work on react native(RN) for slick, smooth and responsive user interface.