How good is "combat training" in black ops?

Are the things that the enemy does in "combat training" the same as multiplayer mode, such as the camping spots. What do people do differently in multiplayer mode than the computer in combat training. I heard playing each level in combat training is a very good way of getting better, but how should... show more Are the things that the enemy does in "combat training" the same as multiplayer mode, such as the camping spots.

What do people do differently in multiplayer mode than the computer in combat training.

I heard playing each level in combat training is a very good way of getting better, but how should I do it so I'm using my time effectively and working on getting better.

Should I play each map for several hours or should I only use one or two maps. Also, what difficulty should I use?
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