I've mentioned My Montessori Journey before, when I was making some language materials. She just made a post about how she keeps records in her classroom and asked what her readers do. I thought I'd share my check list with you. I based it on David Gettman's book Basic Montessori: Learning Activities for Under-fives. This list will take you farther than that though because he described more than that in his book.
You can download my Montessori Skills Checklist.
I use it by marking a "P" for presented, "L" for learning when I see the child working on it and finally a "M" for mastered when the child can do the skill with little to no error.