To write great responses to key selection criteria, you must first understand how your experience aligns with the position and what kind examples you have in mind that you can include in your responses.
Personalising your answers to selection criteria is like writing a detailed CV. It takes time, thinking and research. You need to make sure that your responses make sense. That the person reading your responses isn't going to get bored, but rather read and take an interest in what you have written.
To make sure that your responses will be read and have immediate impact, I suggest reading and re-reading your responses to ensure they read smoothly.
Moreover, it's important to make sure that you have some great example and that you write the examples using the STAR method.