NIE text book / syllabus / teacher guide download

My wife is a teacher and she needs to download text books, syllabuses, and teacher guides from National Institue of Education (NIE).

What is the correct URL to find them? (there’re too many results on google and it is confusing)

How can she find the resources for each subject and download them one-by-one?

Yes, it’s very confusing because text books are published by one party while syllabuses and teacher guides are being distributed by another party. Please check these links for your needs.