Your school/college teacher/s should provide the reference for your application based on your academic ability, achievements and potential for further study.
On your application, you will have to fill in a Personal Statement. The Personal Statement gives you the chance to talk about yourself and helps universities decide between students, especially those who have similar grades. You should include information such as:
- Any extra curriculum activities
- Your relevant interests/hobbies
- Aspirations you may have for the future
- Why you want to study that particular course
You only complete one Personal Statement to support all of your choices, so make sure that the information you provide is relevant and allow plenty of time for planning and proof reading.
There is plenty of help available online, such as on ucas.com, but make sure that your Personal Statement is your own work as UCAS does check for plagiarism.