Order columns in a matrix

Hi

Here's how my column header looks like in the matrix, It's a matrix of team name and grade levels. 

I would like to order the column headers by ascending order. 

I have tried adding an index column but that just landed me with numbers from 1 to 90(end of data set). How does my data know that that I'd like to add index relative to the Grade level and later sort by it?

I have also tried using conditional column. However with conditional columns I am not able to sort it in the matrix since ir renames by grade levels.

I have checked out the following links already - 

https://community.powerbi.com/t5/Desktop/Matrix-Column-Head-Order/td-p/71572

https://community.powerbi.com/t5/Desktop/Matrix-Month-Column-Wrong-Order/m-p/1450455

https://community.powerbi.com/t5/Desktop/Custom-Matrix-Column-Order/m-p/1212350