Question

My topic name is When I grow up speech for 3 minute

Answer 1

Because this speech is for 3 minutes, i won't go into too much detail but:

You first need to find out what you want to be when you grow up. Once you find this out, you can start writing your speech. Try telling why this is your dream, maybe it is because your mother has this job or something like this.

Use emotive language so that your audience will not be bored.

Hope it helps