Keep up with school, friend! You don't want to fall behind. Pay attention in class, ask a teacher or assistant for help. Just be genuinely interested in learning (or fake it until you actually are interested in learning). It's fun, and keeps you sharp.

I suggest Magic Flight Launch Box if you can afford it and have it sent discreetly. Some head shops might actually have them in stores, too (if you're of legal age to go to them). If you're really in a tight spot, you can always make an Apple Pipe (my friend used to make these for his own use, though I've never used one. He didn't use tin foil like the guy in the video did either). Using an apple might help mask the smell, too, but I'm not sure. Otherwise, get some Febreze (for your clothes and the carpet or furniture where you smoke), ozium if you can afford it (you can find it in the car freshener aisle at retail stores and maybe convenience stores; I'll note that ozium is probably my favorite product, since it completely clears the air). Incense and candles also are nice, and are soothing anyway (though your parents might question why you have them, if you live with parents).

As for whether you were ripped off- most likely. It's hard to tell, but that doesn't look like anything I'd want to smoke. Just don't buy from that guy any more. If you can't find any other sources, you might want to hold off and just focus on studying for now. Personally, I'd rather not smoke at all if my product was questionable. But, I'm more about quality than quantity.