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Welcome to the CPL Performance question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.
Runways are named according to their magnetic direction to the nearest 10°. Runway 12/30 has a direction of 120 or 300 depending on your take-off direction. A wind of 300°M is coming from the direction of 300°M. So, if you take off on runway 12, that will be a tail wind and if you take off on runway 30 that will be a headwind.