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I think it’s good to know both the circle of 5ths forward, backwards and upside down, as well as to know the descending scales in order of scale degree.
I have a really cool clock that has the circle of fifths instead of the usual numbers 1-12, so I am always looking at that. For the scales, try doing verbal exercises. Say the letters backwards for 2 octaves: G F E D C B A G F E D C B A
Then start with the next letter and go 2 octaves: F E D C B A G F E D C B A G
Keep it going: E D C B A G F E D C B A G F
D C B A G F E D C B A G F E
C B A G F E D C B A G F E D
B A G F E D C B A G F E D C
A G F E D C B A G F E D C B
This will get your brain super familiar with saying the scale backwards from any starting note without thinking. Very useful during a song.
Another useful mental drill is to do the same thing but in thirds. (Both ascending and descending). This helps with chords, harmonies, and if you get pulled over you can really turn the cards around… hahaha!!!
C E G B D F A C
C A F D B G E C
G B D F A C E G
G E C A F D B G
Etc etc etc.