Recovery of Iphone 4s notes before sync?

I downloaded an app and it deleted school notes of mine… I really need it back, but I didn't sync before this. I had no idea I had to.

Did you have a backup for your notes? If so, you may try Apple's help to restore them.
iOS: How to back up and restore your content
http://support.apple.com/.../kb/HT1766

Or you can use a third-party iPhone recovery software to recover your notes. For example,
http://easy-iphone-recovery.blogspot.com/iphone-recovery-resource.html