Wah How to use "Be Prepared" in two ways.

1. We use Be + Prepared to tell someone that you are ready for something.

• No matter what may happen, I am always prepared for it. (I am always ready for it.)
• We must always be prepared for the worst.
• I am prepared for the meeting this morning.
• Are you prepared for taking an exam?
• He was not prepared for playing football.
• We are prepared for the party tonight, everything is ready.

2. We use Be + Prepared to tell someone that you are willing to do something.

• I am prepared to give you one more chance. (I am willing to give you one more chance.)
• I am not prepared to wait for long time.
• Wah is prepared to help me.
• I'm prepared to do anything to protect my family.
• She is not prepared to listen his excuses.
• They are prepared to let me do this job if I can show them I can do it.

Note: Be prepared for = Be ready for 
         Be prepared to = Be willing to

"So prepare for a chance of a lifetime
Be prepare for sensational news" - Be Prepared from The Lion King (c) Disney