The secret to consistency is to only play when you're at peak physical and mental performance. Play when you're well rested, and really feel like "hey, I want to play Tetris today!" To illustrate, I feel like this about once a week. If I play only during those times, I reach my optimal consistency, which is my qualified grade +/- 1. An average session when I'm in peak condition: S3 S4 S4 S3 S4 S5 S3 S3 ... and then I need to stop playing because my performance (and thus consistency) is going down. I might still get a high grade if I keep pushing myself (I do this when I absolutely want to get a qualification exam), but to be honest it's better to quit while ahead. This will also leave you feeling more positive, and give you more motivation and energy for your next session. From what I understand of it, this is loosely in line with Digital's "Break Theory" where long breaks between sessions promote better performance.