This listing on Wowpedia makes much more sense to me. Since various mobs are either susceptible or resistant to certain spell types, it’s good to know what mob you’re up against to choose effective spells.
1
Physical
2
Arcane
3
Fire
4
Frost
5
Nature
6
Shadow
7
Holy
Also you have “Heals” in your list twice, likely just an oversight (unless you meant two different types of heals?).