i idnt see a way to respond to your question so i'm sending this as a message, sorry about that.  I teach ap chem a a school who is in hte NMSI/VASS program and i teach exactly what she does in those videos.  My kids watched some of the videos and said they were a little long so i may either retape them or try to find a way to edit them for small bits of info. Some of the things i found helpful was giving net ionic quizzes every block.  They are 3 questions, just like the actual test and the kids get 15 minutes to do it.  They reccomended that and it seemed to help.  The though behind that is the question is worth the most of the exam.  I have also set up an edmodo account for my kids as a place to post videos, links, assigments and what-not.  We currently use UTexas online homework called Quest, but they pay for it.