Help needed to understand the JT books vs piano grades, please help!!

[runemeyer]

Hello, this is my first post and my first day here.
I have been taking piano lesons for 2.5 years and use teh JT books ( the modern course ). My issue is that my teacher is not quite sure about where the different exam grades are in the books.  It seems to me like JT 3rd book is actually grade 3+4, JT 4th book actually grade 5+6 and JT 5th book actually is grade 7+8.  Does anybody know or is anybody familliar with the JT books?  I have all the supplementary books.
Thank you so very, very much for all help.
Best regards
Rune