Thanks all!
Concerning the placement tests: I looked at them, and it seemed it would take 2 hours or more to do them. I was afraid I would end up asking them to do 3 placement tests, and they would revolt. I might try to merge the tests or see if there is anything I know they know, and can skip.....
As per the 7th grader - the curriculum the school used seemed really quite week, he is not at all ready for NEM. I expect him to place in the 4 or 5 area.
I like singapore because I like the Mastery approach, as well as the challenging aspect - they are both have strong innate math ability despite their low level of skills.
I do have some concerns about my grade 7 child though - it does seem an awkward place to start a new curriculum, and I am not even sure we will use NEM (I like the sounds of Harold Jacobs and Teaching Textbooks as well) BUT we might use NEM. However, the reality is he is starting something new, so singapore it is (unless someone has a much better idea;))
Kathy