Can someone clear things up for me here?

I have been going over some lessons that I have already done, simply so that I can have them rate with 4 hearts instead on 1 or 2.

But as I go over them again, I will often get only the same amount of hearts as I already had on it... and yet I still get some credit points for it.

I don't want to overload on points before I am truly of the right standard that the system classifies me as.

Sincerely,

-- Karl.