Hey 1-99!
Although I cannot give you anything specific to HSC Chemistry, as someone who has run 10 or so online classes for English I can tell you from this side of the industry what tends to work better and what doesn’t.
1.
Prerecorded lessons are tricky: especially if you want to ask questions, unless they have some help hotline, these pre-recorded lessons are the same gist as Khan academy (which is free). My little brother goes to Dr Du - the main advantage he’s getting is just practise questions at the moment because the classes are just Dr Du speaking in front of a whiteboard. So consider what it is you need.
2.
Places with too many students are tricky: I work alongside someone who does selective high school tutoring and the intel is that with Pre-uni and places with >10 kids/class, it’s crazy. Kids fall asleep, there’s just so much ambient noise etc etc - so try to make sure you pick a place with a good number of students/class
3.
Consider how they are going to mark your work: online classes are great and dandy but unless the tutoring places has organised a way to provide feedback, it will be hard to reap the full benefits of tuition. Because I do English tuition we spent a good amount of time perfecting a feedback system that works in real time during the lesson and will not be lost after the lesson.
4.
It’s better than you think: online lessons can actually be pretty lit if you find the right place
Think about the lack of travel, the convenience of your computer and yes - you can wear pyjamas and no one will care
I hope that was helpful and hope you find a great place for HSC Chem!