Maybe in atosave, Computers mostly save what your working on :3
Take it to the Apple Store and they will help you or you can go on their site and press "Forgot Apple ID." If you choose the second option you have to enter the first and last name, and the email you used for the iCloud on the iPad.
Answer:
to remember the passwords you could either make a little rhyme to "help" remember it or you could be like everyone else and write it down on a piece of paper. you could also write the password over and over again to make it stick. a way to make a password different from an old one is to use completely different wording and completely different numbers.
Explanation: