Sort by Custom Categorisation of X-axis in Column chart

Hi 

What's the best way to sort my x-axis catergories to a custom order. In my case I am counting the number of grades A+, A, B+, B, ... etc also, UG and NA for ungeaded or Not Applicable.

I have used groups but this is ugly as it shows the number I have assigned. 

I have also tried to do these techniques but didnt work as desired. custom sorting in power bi | power bi tips | power bi scenario | ssu - YouTube

Q