At your age, worrying about the specifics of a program is not nearly as important as eating and eating a lot! You are in your prime right now relating to ability to pack on mass. 15 year olds have test levels off the chart so take advantage of it while you are still young! Being 130lbs it shouldn't be too difficult or expensive to get your hands on enough lean protein and clean calories to put a nice little dent in your goal. 10-15 lbs might be a little out of reach for the time period you have set for yourself, but 5-7 lbs is defintely attainable.
As far as lifting, just concentrate on one thing. Balance.
For every pushing movement you do (bench press, shoulder press, dips, etc..) make sure you have an equal amount of pulling movements (rows, pullups, etc..) For every quad dominant movement you do (squats, leg press, lunges, etc..) make sure you have a hamstring movement to balance the equation (deadlifts, hyperexetnsions, good mornings, etc..).
I think people get too wrapped up in rep schemes and forget all about good ole fashioned hard work.
How many days do you have to workout each week? Lemme know and I'll put a basic template together for you accordingly.
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