(I’m assuming your teacher means movie when they say film)
There are spoilers is you haven’t seen this and have an interest in watching it. This is long incase your teacher is looking for a detailed explanation but you can always paraphrase or summarize what I say if they want shorter.
My favorite movie is the movie Scream. It’s a classic horror genre film and yes, I believe this is a typical example of a horror movie. I think the mood of this film is suspenseful and shocking. Techniques that I think were used to create this mood was the use of luring the viewer into a false sense of security when it came to who the killer actually was. If you’ve seen this then you know the killer was Billy and Stu. This came as a shock to me because both Billy and Stu had moments where they were on screen when the killer was as well. Thus, making you believe that it was neither of them. For me personally, Billy and Stu were my favorite characters so I was shocked to find out that is was the two of them working together(hence how they could be seen with the killer) I think this made the move suspenseful because you could never be sure where it when the killer was going to strike. And when I started to suspect that Billy may have been the killer, it was made to seem like he was proven innocent. There was even a scene where he was “killed” by Ghost-face(that is what the killer is referred to as)So all my theory’s went down the drain. But like I said earlier, Billy and Stu worked together so it was all just a ploy to make you think Billy was innocent all along and he was now dead. But it was incredibly shocking when Billy showed up again and revealed it was all just a trick. All of these things mentioned made the movie very shocking and suspenseful to watch.
I hope this is what you were looking for and can help you.