when i taught this level I taught 10 minutes each lesson learning phonetics and the phonemic alphabet. Most students think it's a shouting game and really enjoyed it. Within a month or two pronounciation was near perfect and they learnt how to use a dictionary.
Books at this level tend to be a bit simple for a lot of Thai students if you stick them, I would go with more concept checking with games, projects etc to really reinforce the learned language.
There are some very good books available for classroom activities, perhaps this is the way to go rather than another course book to charge through.