I'll just be blunt, then.
If the assignment they gave you is any indication, then you will still suck at photoshop when you're finished with that class. In my opinion, it is not worth the time and money in when you can learn the same techniques off of any of a dozen websites in less time.
I'm not hating on you or your homework. I am trying to enlighten you so that you don't wake up one day after you've taken 3 or 4 of these classes and wonder why non-artists with no formal training are running circles around you at photoshop (or lightroom or whatever).
If all you can discern from any of posts is some kind of insult, then there's nothing I can do. People will see what they want to see.