Hello! I can sympathize, as I think I got stuck on level 3, and later on level 6. In both cases, I did make mistakes, but the course is very rigid, and mistakes are tough to recover from. Further, you can't really skip over many parts as the course builds on itself. Tough to have a realistic course like this that is also user-friendly.
I did check your Code School account, and it looks like you completed levels 1 and 2. Is that the case? So, have these questions been resolved?