What order should I practice sight reading pieces?

I thought I would re-post this very useful question that Manda asked previously, as it is something that I refer to over and over.

So, what order does Hellene recommend that we practice sight reading pieces..?
Here's her answer:

I use the following order of the Albums for the sight-reading (from the simple to advanced)

1. Nursery Primer
2. Favorite Classics Primer
3. Nursery 1
4. Christmas Carols
5. Christmas Classics
6. Favorite Classics 1
7. Boogie 1
8. Boogie 2
9. Favorite Classics 2
10 Favorite Classics 3

A also want you to know that if you see # or b after Treble and Bass Clev, the piece is going to be harder to play in a level or even two.

This is why, I would recommend you to do as following:

1. Read first the pieces with no # or b
2. Read only pieces with #s
3 Read only pieces with bs

In future you will start feeling the different tonalities and won't make as many frustrating mistakes with all the sharps and flats being overlooked. But now we have to be nice and loving to ourselves! We are BEGINNERS!