I'm in 6th form, and everyday I take a notebook with hole punched paper, and a lever-arch for each subject, with dividers (Which I have found is necessary for me personally.). I have a fold-able tote bag which I put inside my normal bag to put all my lever-arches in. I also have a pencil case in my bag, with pens, highlighters etc. I know some people carry hole punchers, but I don't think it would be necessary since most teachers have one if you ask and we have a large array in our work rooms. Some things I've noticed others doing is having one lever arch with dividers that they keep all of their subjects in, or having individual plastic wallets that they keep all of that topics work in, then file it when they move on.