@Fl0renc3sW1fe I'm not in Y11, but here's what I'd suggest:
- Notebook: You can write notes for all your subjects in here and use them to help revise.
- Highlighters: Make key points stand out and maybe use colour code to highlight how much of a certain thing you understand, if yk what I mean
- Pencil + rubber: Draw diagrams if they help you remember stuff
- Different coloured pen: Mark nd write answers in. They stand out more
- Post-it notes: Really good to use in workbooks to write down points, they also stand out.
No idea if you do need all of this, but this is just my list of stuff that hopefully would help :)