1) "What kind of classes are you taking?" is a 500 times better class than "what classes are you taking?" Nobody cares about what actual classes people are in unless they are very close and are likely to forget anyway. My parents asked me 189203 times this summer what classes I was taking, and I'm sure they still don't know. Not only that, but most students hate to answer this question because they get asked all the time. I would say it'd be better just to find out generally what type of stuff they're interested in, if anything.
2) I couldn't be more excited for this upcoming year.
3) By the end of last year, I had stopped saying "hella." When I realized this, I couldn't even look at myself in the mirror for three days, I was so ashamed. When you don't say hella, you let the whole bay area down. I pledge to continue saying hella all year this time, and hopefully my whole life. It could be cool to try to work it into writing too. Any thoughts on this? Is it too colloquial?