How to improve my project?

Hi guys I'm building engineering course student On architecture design subject we should find good solution for this place with trees. It is my project, ( elementary school campus) I should show this to prof tomorrow but I feel like there is so many mistake on building shape. I really need to improve it. Could you help me and suggest good solutions pls. ( left side big building is gym, big space in the middle of 2nd building is open space for good ventilation, we can't move trees.