ok, to answer my own question, for anyone else considering this:
no pre-test is needed to get to the algebra class, it is 'stand alone'. as to the class itself, it starts at what they call 8th grade level, but there is some review:
prime factorization, working with fractions, working with exponents, etc. but these sections are pretty short so far, I suppose because ds has been able to get all right. I seem to recall if any mistakes are made there are 'consequences' in the form of repetition of exercises.
It appears to move slowly according to the big picture chart I see of progress, but he is at least tolerating the pace so far.
