SPSS Research Analysis Help

Hi I need help with my research analysis. What SPSS test do I do? I have a study with 1 IV 2 levels, pre and post intervention. I have 1 dv which are stigma level scores. There are two student groups, maths and art students. Both student groups watch a film and take questions about stigma before and after the film. The maths group is the experimental group, the art group is the control. I know it is not strictly a control. What analysis do I require please?