Target audience for my School Magazine

The target audience for my school magazine is going to be students from year 10 - year 13 from Plantsbrook school as I feel that most of the content going in my magazine will be more applicable and helpful to them where as as lower years won't find the content appealing as it isn't important and informative to them.  This is because I will be covering topics such as gcse and A level revision and other revision material. However, certain issues of the magazine could appeal to the younger audience such as charity events or other events that take place in the school