so how does Asperger's affect learning? slower, faster, the same as any other 12yr old

I think this is one of the areas it differs in the same as other 12 yr olds.  Except in the special interest stage.  Like in critter's case.  He has forgoten more about the universe and space than I will ever know.  The age of the universe and the expansion rate since the big bang.  The age of the earth.  If it's a special interest area they can talk about it forever.  Critter also knows about a variety of edible plants.  He also has a huge amount of knowledge on insects.  We go through a seasonal phase of interest.  Summer when he can go outside it tends to be insects.  In the winter it's computer and discovery channel.

Most are visual learners.  So,  the thing that works well for most is social situation flip books.  Critter still has one even though he rarely uses it anymore.  Lots of lists, labels, and routine.  There tends to be a lot of ADHD in these kids.  Critter is exceptionaly smart.  He just has the social skills of a much younger child.  Some of these children have fine motor issues too.  We lucked out here,  even though critter can't throw and catch a ball, he can climb like a monkey.

There are a lot of things that the teachers do to help with the ADHD problems in class that don't involve medication.  In grade school a wiggle chair was employed.  It's like a board with a ball on the bottom that can rock in every direction.  He as a safe room in the office where he goes when class gets too frustrating.  His teachers have also employed what they call fidgits.  Things like silly putty and small objects to fidget with in class that keep him in his seat.  Since he was diagnosed and the teachers have become aware of his issues his grades have improved.  The middle school has proved to be even better than grade school.  We have had fewer problems and he gets all A's and B's.

ttfn