What is an evidence? An evidence is/are supporting documents and witnesses that can help you prove to the judge or hearing officer that you are right.
You can start collecting evidence by:
Interviewing people who have something to say that will help your case.
Reviewing all important documents and records that relate to the issues in your case.
Collecting evidence for your case while the facts are still fresh in your mind. Your case will suffer if people forget the facts, witnesses move, and documents are lost. In other words: evidence grows old quickly.
Remember: DO NOT submit evidence against yourself, which may weaken your case.