As the character is called David, the best would be a male voice! (If you're a woman, you can change the name!). Natural / slow speed please. (this is for 11 years old students). I'me not sure for the expression "regular/basic classroom" (as opposed to specific classrooms such as labs, ICT rooms etc...). Feel free to make corrections! ;)
My name is David, I go to St Andrew high school and I’m in Year 8.
St Andrew high school is not very big: there are 20 classrooms. For example, there are 10 regular (or basic?) classrooms, there is just one Science lab and one ICT classroom with 15 computers.
There isn’t a music classroom. The school library is big, there are hundreds of books! The dining hall or cafeteria is small, but the drama hall is large. There is a sport pitch but there isn’t a gymnasium.
My favourite place is the playground because this is where I play with my friends.