Each Real Grade A should have independent unique method, why not show some proof?

Many "claimed" grade A said they are grade A 

Why not show some mark six historical data testing result to proof Grade A ability ?

Not counting terminator or cheating in future

I have shown historical mark six data proof 

It is your turn to show quality.

https://www.qwant.com/?t=videos&q=%E5%8D%83%E7%8E%8B%E4%B9%8B%E7%8E%8B&o=0%3Ai8jxnHfo9l8