What is the difference between les gens and le monde? They both mean people right?

And also, I am going to have my first oral final, how should I prepare for it? Is there any tips for me?

I was in French for 2 years. The best advice I can give you about your oral final it not look confused. Even if you pronounce it wrong keep going like you didn't. Nobody in the class will know what you're saying anyway. Also, if you are writing it down try not to look at your paper that much. Eye contact with the audience makes it look like you know what you're doing. I'd try to memorize as much as I could the night before.