There is a lot more to Lesson Planning than simply filling out a sheet of paper for that day's class. A teacher needs to develop and maintain a "big picture" of the students' abilities and needs. There are therefore some "levels" of planning, beginning with wider, more general issues (for example, how will a month's instruction tie in with that session's testing?) and finishing with the focused thought and planning involved in creating a lesson plan for a 40-60 minute class.
The former (wider, more general set of issues) is is the sort of planning that should take place prior to beginning a monthly session (or whatever period of time is applicable to a general "unit" or "level" of study). If you have a very well established class that is guaranteed to be longer term (say six months or a year), then this process should follow extensive level testing and curriculum design - having been created by your institution or yourself depending on your experience and position/responsibilities.
In terms of planning material and mehodology for a month's study, a teacher should take some time to think about a few key issues. The free download on this page may provide some helpful guidelines as to how a teacher can plot a course for a class over a one or two month period.
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