Examiners don't want to be surprised by new ideas or opinions in your conclusion; they just want to read a summary of your overall answer to the question. The easiest way to do this is by paraphrasing what you wrote in your introduction. For example:
It is true that ex-prisoners can become normal, productive members of society. I completely agree with the idea that allowing such people to speak to teenagers about their experiences is the best way to discourage young people from breaking the law.
In conclusion, I fully support the view that people who have turned their lives around after serving a prison sentence could be used to deter teenagers from committing crimes.
Examples of paraphrasing:
- I completely agree with the idea that = I fully support the view that
- become normal members of society = turned their lives around
- ex-prisoners = after serving a prison sentence
- discourage young people = deter teenagers
- breaking the law = committing crimes