Got two kind of people in ST la.
Those who everyday slack so come to grading scared under performance... (but then should have already known it from boss feedback)
Those who worked too much scared go unnoticed or unrecognised (smart abit la, this year covid-19, pay cut, freeze, work so hard for fun ah?)

Basically just be as professional as you can everyday. In your work.
In your interaction.
In your progress.

And the rest will come.
And if you don't get the grade you want? Quit? Find another job?
You should be finding for another job on a daily basis also.

Don't wait for a grade to wake you up.