In my opinion it sounds like you're blaming the weed. You have to get motivated yourself, i can do english/philospohy/french essays or whatever all while blazed out of my mind. Weed isn't an excuse in my book. About forgetting stuff, i never really get that so i can't comment. I will say you definately don't need to take a 7 day break because you have a test coming up, that is ridiculous.