Where do you live? It's not too hard to get a job at a place like McDonalds. $7 an hour (probably higher)
Let's say you work 6 hours a day. $42 a day. $42 * 7 = $290+. That's more than 0.3 BTC and its better than slaving around your PC all day doing surveys.
I'm underage to do a job in my country. That's the problem.
you are still under age, but why would you really want to get a 0.3
BTC in a week?
why not try to make a profit out of small things, and if you've learned a lot, maybe you can get bigger.