No you definitely don't
For maths what you learn in yr11 should be second nature such as applying differentiation etc. And who writes notes for maths anyway?
English- obviously not since none of the texts you do are the same, unless you're planning on reusing a related text for yr12.
For sciences- speaking for chem and phys you definitely do not need to revise yr11 syllabus, having a strong foundation will help you learn faster for HSC course but you will relearn most of the stuff anyway (eg. Naming, equations, intermolecular bonding as well as the force/electricity topics etc.)
In fact the most I learnt during the yr11 chem course was applying directive verbs in answering - something people don't pay much attention to.