If your Thai learning adventure has become a struggle due to the lack of intermediate to advanced materials, check out the University of Wisconsin’s Thai Reader Project.
The authors have attempted to create effective lessons in the reading of Thai that will help learners progress from the level of basic literacy to reading at the advanced level.
The lessons are based on authentic readings of the sort that learners of Thai will encounter in daily life in Thailand, ranging from basic informational texts to such as menus, timetables, newspaper advertisements and the like, to more complex texts such as news articles, editorials and short narratives.
There are two readers with 76 lessons. Volume I is for beginners up to high readers, Volume II is for intermediate to advanced readers. These are free resources which can be downloaded as PDF files.