Could somebody please explain?

[MadMum.com]

Hi everyone, my dd is sitting her exams this September. In January I purchased lots of books and materials from a certain selling site. There are loads or different editions etc.

The bit I'm a bit stuck on is I believed I brought a lot of packs that were nfer/gl assessment. As my dd is sitting both the Kent and medway tests and I believe these are the most relevant. Tonight I have been sorting through them all. And a majority are all stating Letts. Could someone please explain the difference, as I'm now concerned that I have been teaching my dd the wrong stuff.

[yoyo123]

Letts, GL and NfER are the same, just different companies taking over the publication. Don't worry

[MadMum.com]

Thank you yoyo, huge relief, thought I had just spent the last 8 months on items that won't be included!