go to the
iicrc site and a list of classes for the year can be found there. I know Jeff Cross does some classes, and you'll get some great info from guys on here also. that you may not find at a
iicrc class but may work even better in some situations.
I did the class 1st which gave me a good overview( a lot of hands on), then did some practice on my own and picked up some tips regarding crayon use (from mikeysboard members) that has worked well for me.