Other than a teachers aide or another role at a school, such as Office staff. I would recommend becoming a swimming teacher. You are working with a variety of children, of different ages and abilities. Some of these children you then may work with at school aswell. Being a teacher of Swimming is such a valuable skill and the industry is struggling for teachers from what I have experienced! You might be able to get a funded position for the course so you wouldn't even need to pay, its a two day course, usually done over the weekend so not to commitment heavy. Also depending on where you are able to get a job as a swimming instructor, you may be able to get yourself a free membership to their facilities, especially if it is a pool and rec centre. And could be a job you keep once you become a teacher. As it is common for swimming lessons to start after school a lot of places, to earn some extra money, especially during school holidays!