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I have a daughter in 7th grade next year who has already done Exploration Education, the science recommended in RevToRev. I was thinking of ordering the science package one year below (ResToRef), since we are new to HOD and she hasn't done this. Would I need to order the teachers guide for ResToRef in order to use this?
Also, I have an 8th and 9th grader that I plan to combine in MTMM. Would I need to order extra kits for their science? or would they share everything?
Thanks!

If you choose to do the science from RtR, then yes, you will need the manual. We are doing this program next year and I can't wait.

As for your other two kids, I believe the kit comes with 5 sets of stuff. So unless there is a student workbook with it, then you do not need to order anything extra. I haven't done MTMM yet but I just checked the guide and it makes no mention of "one per student" so my thoughts are getting the set as is will be great.