Due to the new level cap, it has been a few changes in combat rating since the release of the Wrath of the Lich King, but now many players can reach.
   Spell hit rating is one of them, now call it as hit rating. There is an update for hit rating, which revise for the new level cap of 80.
   Spell hit is a combat attribute that increases a caster's chance to hit with spells. For the most part, it is obtained from talents or gear that has hit rating. The more a caster gear with hit rating, the lower the caster's spells will miss the chance. With patch 3.0.2, spell hit is capped at 100%; with enough spell hit, it is possible to reach a state where it is impossible for your spells to miss. A spell that fails to hit is shown as a miss, while misses caused by a target's resistance is shows as a resist. Spell hit has no effect on healing spells, as they will always hit.
   With the Skull as the level, all Raid Bosses will act as though as they are three levels above you, which mean that, they will have a 17% chance to resist your spells. Though, there are many ways for you to increase the chances of having your spells hit your target
To increase your Hit Rating is the fastest and easiest way. Depending on what spec your Mage is, you will grab one of the two talents or both to help the chances of your spells to hit.
In the Arcane Tree, you have Arcane Focus which increases the chances of your Arcane spells to hit by 1/2/3%. In the Frost Tree, you have Elemental Precision which increases the chances of your Frost and Fire spells to hit by 1/2/3%.
Some stats such as Spell Power, Critical Strike Rating, and HasteRatingon many Caster DPS gear you will see later. The other stat you will see is Hit Rating. At level 80, every 26.23 Hit Rating is equal to 1% Spell Hit. Grabbing gear with Hit Rating is essential to any raiding Mage.
Hit Rating Gem is another way to increase your Hit Rating. Here are a couple of Hit Rating Gems you may use depending on your own Spec, stats, and socket colors.
What you do depends on what you have to work. Now that you are ready to start running some instances, you need to know what other classes have to offer which may also help increase your Spell Hit. There have been some changes with the way raid buffs stack now, and many class buffs have been changed.
A Draenei is the only buff that you can receive that will increase your Hit Rating in your group. Having a Draenei in your group provides you with Heroic Presence which will increase your Hit Rating by 1%.
In the same way, there are two debuffs which may be applied on a target which will also increase your Hit Rating. A Shadow Priest will provide the raid with the Misery debuff. A Balance Druid will provide the raid with the Improved Faerie Fire debuff. Both debuffs will give you a +3% Spell Hit on the target. These two debuffs will not stack.
At length, you should take three levels above you and boss with a skull as their level into consideration; you'll need 17% Spell Hit to become Hit Capped. At Hit Cap, your spells will have a 100% chance to hit your target, and is the number you would like to aim for. To large scale, the more Hit Rating you need from gear, the more you have you spec and raid members at hand.