Performance updates

Performance and graphics updates and improvements.

Performance and graphics updates and improvements. Additional questions

-fixed various display errors

- Fixed database error

- Organized the menus to make them easier to access
- Made it easier to get the ebook for Military Pilot Preparation
- Updated with ebook and video links
- Fixed various issues and bugs as reported by the users
- Updated the graphics to reflect core focus
- Performance and stability improvements

- Fixed the issue of screen freezing in "Non Verbal Reasoning Tests" on some devices.
- Fixed the display on larger screens.

- Now compatible with iOS 11
- Improved the performance and stability