As thugulike says, schools will be most interested in your experience of working with, and attitude toward children, so really focus on that. At my daughter's school they had nearly 200 applications for 2 TA posts last year, and they immediately discounted any who had not previously had direct experience of working with children, whether in a paid or voluntary capacity. Have you had to carry out placements as part of the course? If so, focus very much on these in your application. Good Luck.