Mock elections are a great way to get to understand how elections work and what parties stand for.
It's not too late to order a school mock election. Parliament’s Education Service provide Election Toolkits for teachers and students who want to get their own election up off the ground and explore how elections work. See http://parliament.uk/electiontoolkit for more information.
Parties also provide information for student candidates. There is lots of useful material available for Conservative candidates in mock elections at https://www.conservatives.com/studentelections - where you can order your own mock election pack, download templates for your newsletter and design your own candidate poster.