Oh thats not good, at least your not in Pakistan or France if you fail one class you have to repeat the year. (Well for the Pakistan thing thats what my dad told me since he had his High School days there...) I remember forgetting my books in school. The teachers would let me get them from my locker and once i left this obese textbook at home and kinda had to be a ninja and hide from the teacher. It's not your fault really, and if you really are an academic failure get a tutor for a while. I was like failing math (not really) I got a D- on the math final however even though I got like As or B+s in Advanced math. The tutor made me understand things I didn't understand and now I do ^_^. I don't know about tutors for economics although it is tricky. If only tutors were like the "Tutor kings and queens" of China, Hong Kong, and Taiwan. Those guys are like celebrities that tutor for final exams. Good luck
I finished HAVO with only 8's and 9's and then went to HBO. But since I suck at practical assignments I failed my internship and I had to drop down to MBO. And now I'm only getting 9's and 10's. I'm bored as fuck in class.
Those schools are strict about the rules to teach those students a form of discipline and prepare them for the real world. If you can't even follow it on your first day then maybe you belong there. Unless you prefer teachers to be more relaxed and less strict. (?)
Sorry to hear about your troubles, mate. I'm excellent in Math, I was in the top percent of my College Algebra class last semester. As for economics, I've always been a bit shaky there.
Try getting a tutor or joining some friends for a study session, it helped me. As for the book issue, might wanna consider chaining it to your wrist. My old Physics class was the same way; no book, no class.