Post earlier. Make your questions interesting. There are more possible points for the discussion so even if you miss one or two, you will still get the maximum if you do everything else well.
Reminder – full points are for excellent work. Just completing all the work does not guarantee an A. That isn’t fair to the people who make an outstanding contribution to the course. They deserve special recognition for their efforts and participation.
There are also Extra Credit assignments. These are another way to get some extra points through extra effort.