1. Raid Awareness: the ability to notice any and all changes happening during the raid at all times.
2. Knowledge of Role: Understanding the full extent of the operations you are able to do at any given moment in a raid.
3. Communication: Being able to convey and discuss your thought's with respect to the raid, including the ability to convey priority information to the raid.
4. Personal Responsibility: Save all stressful thinking for after the raid and actively identify and resolve errors that you had made after every raid.
5. Have Fun: Do not enter a raid feeling tired / stressed / pressed for time / etc. Either go in blank or go in excited. Maintain a positive attitude for the whole 90 minutes despite what happens in those 90 minutes.

Tons of ways to do this, but given around 2 months playing for 15 hours a week I think you could be a world class tank. Or at the very least the tank everyone wants to play with.