A strong introduction is an excellent way to predispose the examiner towards giving you a pass or fail grade.
Imagine you are working with the question:
Analyse how tension was developed to show opposing viewpoints in the visual/oral text.
Next, try to answer the question, as quickly as you can using bullet points:
1) list points of tension in the film
2) identify who had opposing viewpoints and list the scenes that shows how their viewpoints are developed
3) list the film techniques that contributed to a feeling of tension.
Some ideas from Blood Diamond:
Points of Tension and Opposing Viewpoints summarised ideas with dialogue as a film technique.