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Saving in TAC favorites is probably the best way to make challenges available as long as you remember to do it before the challenge changes to the next month. This will give you that one lesson. Sometimes I struggle to remember the name of the challenge from the TAC favorites. I save the lesson from that month in my browser favorites so I can open it along with the rest of the challenges that month. I can include addition info in the favorite name to help me remember too. Sometime I get behind and I keep a separate browser windows open for the month I missed so I can catch up if needed that way I have all the challenges open. I use google browser and name the windows so I can keep them open but separate.