Since there wasn't a question in the post before mine, I'll answer the not-so Legal questions
Not a legal studies question: Do you think total world order/world peace/world security is achievable?
No. It's an ideal, not something fixed that is able to be achieved. Yes, we need to work towards it, and a more peaceful world is, and should be, achievable. But total world order requires that there is never someone who works in (the UN, world government, powerful regional federation, etc) that gets power hungry, or even mistranslated, or makes a decision that disgruntles an already unhappy nation, and war breaks out. Civil wars can start over something tiny--who owns that particular cow, or piece of land--and quashing these struggles, without being incredibly violent or classist (ie, implying that peasants are stupid and shouldn't squabble over such things) is very difficult.
Possibly a legal studies question: Contrast between legalisation and decriminalisation?
I don't think we need to know this, but when something is decriminalised, it is removed from the criminal code. It may not still be legal (such as possession of small quantities of marijuana in SA) but it can only attract a fine and I don't believe you will be required to go to court/have a criminal record etc. Legalisation means that something is legal and you will not attract a fine, etc, for doing this act. Sometimes these can be done together (ie, the Abortion Reform Act 2008 (Vic) both decriminalised and legalised abortions) or they may occur seperately, at different times.
Next question: Distinguish summary and indictable offences, giving examples where necessary.