I think yellow is suitable for classrooms since yellow stands for wisdom and success. It will encourage students to listen carefully and work hard. When reading, students need a quiet and comfortable space to enjoy themselves. I think blue is a good choice for reading rooms. It makes them feel calm. While for the playrooms, I suggest green. Green makes students feel energetic. It will help students exercise more. At last, I think you can paint the outer walls of the school white and draw some colourful pictures on them. And that will remind the students of the exciting school life.