Maths and science (specifically chemistry and biology) tuition for children of ages 5-16 for SATs practice and GCSE help

I would love to offer maths and science (mainly chemistry) tuition for children of ages 5-16, whilst I am not a qualified teacher I do have a 9 at GCSE in both of these subjects and I am completing my A Levels in both of these subjects currently to which I am predicted an A*. As an experienced young leader at Brownies, I have good communication and listening skills which will be crucial when teaching students new ideas as I have to use clear and simple instructions in order to help them understand. I have also been able to develop my problem solving skills and creativity through my volunteering which will be used when faced with a problem during my tutoring sessions.