Sorry guys, I didnt really give enough background information. The course I'm interested in for university is not a pure music course, it's called "Applied Music" and combines music with sound technology, recording, etc. So basically it's about half music and half engineering.
But yes, I really wish I had more time to practice. I have a ridiculously busy schedule with school, trying to juggle AP classes with band with after school activities with playing guitar in various worship bands. But every time I have spare time I use it by blowing on my horn.
As for my lesson teacher, he simply told me I should play long tones and try a stronger reed, so even as I write this a box of Plasticovers 3 are on their way. But he also tells me that as a musician it's very important to seek the advice of many musicians, not only one. So that's why I am writing on this forum to see if anyone else has suggestions.
But thanks VERY much for all the suggestions so far, I'll work on all of them. Martinman, what exactly do you mean by 'experiment with tounge position'? Just like put the tounge in different places, or what?
Thanks guys, this is a great forum.