Question

How to sing on a very high note if your voice is hard?

Answer 1

Continue to move up the scale repeating the mmmm aahhhh until you reach your vocal break. Even at your break where you need to change into head voice, try and keep an even, clear tone. Work on having a clean switch between the two. Move higher up the scale in your head voiceuntil you hit the top of your range.
I hope it will help you