Skinny Guy, DESPERATE!!!! please help

I am 15 years old and I am 5'9 and only 125 lbs. I've been trying to gain weight, but cant. I need a lot of help, please help!

1)How many calories should I consume in a day
2) What are some good foods that will bulk me up
3)Are there any other tip or tricks for getting bigger
4)What are key factors to getting bigger, heavier and stronger


Please help me
 
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