My (Thai) wife is about to start an English Language school at our local temple to help the kids improve their English, and is searching for suitable textbooks for her students to use.

Every set of books available in our local book shops seem to be littered with basic language errors.

Any suggestions or recommendations for an error-free set of books for Prathom 1 to 6 curriculum would be much appreciated.

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Our school uses "My First Grammar" for our P1-3 grammar classes which I think is really good, as it goes relatively slowly and has lots of pictures, and My Next Grammar for P4-6 (I don't use this one though, so can't comment).

My First Grammar is really good for a 1-2 times per week book, although the teacher needs to know how to explain the grammar rules etc properly as the text book doesn't do such a brilliant job of this.  There is also a workbook that goes with it (And funnily enough, often has quite good explanations of the grammar) but it's quite difficult to get ahold of real versions of it (And is essentially just more of the same exercises as the classbook). 

We also use Family & Friends, which has a workbook + grammar friends (grammar text book), the combination of the 3 is really good for an everyday type of class as it has a variety of different activities etc to mix things up (Probably not so great for tutoring though unless she was tutoring every day after school).