I remember it very well.
My first book was called Surprises (I think the full name was Funny Surprises). It was bright yellow and had a hard cover. I then progressed to Mr. Whiskers and then Toy Box. All 3 books were in the first grade.
In grade 2, I read Magic and Make Believe. Treats and Treasures was the book in Grade 3.
Grades 4 to 6 had books called the Young Canada Readers series,
All these books were published by Thomas Nelson and some of them were written by John A. McInnes. Sadly, they are now out of print.
I would love to get hold of these books so that I may read them to my son. I saw a couple of them on Ebay, but the prices were very steep.
I give these books a lot of credit in helping me learn to read. I was 6 years old when I read my first word in English. By the age of 9 had already read White Fang and The Call of the Wild by Jack London.