Is there an iphone app that you can use for schedule plans?

I'm very organized and i have been looking for an iphone app that will help me with my schedule and it has to eb precised is there any good app?

Nothing's wrong with the Calendar app in my opinion.

Awesome Note maybe what you want.
Awesome note is the only application that combined Note-taking and To-do list which helps you to organize your life with the ability to keep everything.