The two A2 exemplar trailer analysis:

Paralysis:
Camera - The first technique I noticed was the use of a slanted angle, the student used this to show some disorientation and confusion for the audience. This was to create a sense of mystery in the horror. Another effect that was used was a negative filter, this was used to create an eerie shadowy atmosphere. It also links with the sub genre of psychological horror because the evil spirits tormenting the victims normally have a hidden face.
Editing - An action match was used in one of the clips. The first camera shot was the boy's mum and then it shot what she was looking at. This was used to show the audience exactly why the mum was frowning, the painting that her son drew was rather frightening. As well as this, there were  a few quick cuts towards the end of the trailer, this was used to help build up the pace and also it showed how severe the boy's scary thoughts were.
Mise-en-scene - Different settings were used, for instance the boys house, then his school. This was done to help us see that this is a trailer as it has snippets of different scenes. Also the setting of the boy lying down on the sofa and the man questioning was very realistic. The positioning and the background of the room made it immediately obvious that he was having a meeting with a psychiatrist.
Sound - The non-diegetic music used in the trailer created quite a suspense feeling, it was also very creepy, fitting into the genre of horror. Also the dialogue is very simple and minimal, this is good as it makes the audience want to hear more. Additionally, trailers only need a minimal amount of dialogue as the text overlays narrates what's happening.

Caution:
Camera - The first camera technique used in this trailer is a low angle on the 'killer'. This is done to make the audience immediately know that this character is the antagonist. It also makes the audience feel inferior to him as they're looking up to him. There are a lot of close ups used on the killer this makes him more mysterious because no one knows who he is as they're just seeing some specific body parts.
Editing - When the scenes cut, the transitions used are very fuzzy, it seems as if it symbolises the end of someone's life. This is quite possible as he is in a empty school suggesting he has killed a lot of students.
Mise-en-scene - The gas mark used for the killer was very good, this is because it made him unknown, the only thing we know is that, he's a man. This creates a general fear towards all men. Also the setting of the trailer felt rather unrealistic as horror stories don't really take place in a school.
Sound - The diegetic sound of the blood dripping, makes it obvious to the audience that this man is a killer, it also makes us sympathise with the person he has killed as we are seeing their blood.