I think a good starting point for HSC English would be to go through the syllabus document for the level(s) of HSC English that you're taking, and familiarising yourself with the main themes/ideas/issues raised within each module. Once you've done this, it would also be a good idea to familiarise yourself with your prescribed texts (if you know what they are) as this can make analysing them quite a less demanding experience as you would've gained an idea of what each of your prescribed texts covers (in terms of themes/ideas/issues raised by the respective module) in advance. Another thing you can do is go through a list of techniques that you have covered all the way until your current point. This would be a good way of revising those techniques (which you will likely need to utilise frequently going forward, whether in analysis or essay writing), including what the technique is, how it can be used in a sentence/text as well as the effect it generally has when used in a particular quote/text.
I hope this helps!