You score KNOWLEDGE points every time you prove that you have learned something. The score is an accumulation of all the knowledge points you have scored in the past. You will get negative points when you get something wrong, but you thought you knew it. There is no upper limit, because when you move on to refresh, you will get points for showing that you are still competent.
You score GRIT points by being persistent, spending time and working with your weaknesses. The score is an accumulation of all the GRIT points you have scored in the past. There is no upper limit, because when you move on to refresh, you will get points for doing that. You cannot get negative GRIT points!
Your META LEARNING score is a measure of your ability to know what you don't know. If you think that you know something, but you really don't, you get negative points. If you answers something correctly - and you were aware that you knew - you get positive points. You want to keep this score in positive!
These scores are meant to help you monitor your good learning habits!