For physics I have Chris, who's literally the smartest but also funniest guy I've ever met. The way he explains confusing topics actually surprises me like I'll never forgot most of the stuff I learnt with him. His question are also unique and hard which rlly improves ur problem solving skills and helps answer hard hsc questions. All the tutors at sigma also genuinely care Abt you I love them
I have Dr B for chem and she's the sweetest lady she always asks me how I'm going in school and she's also such a pro for chem. The chem notes are made by a previous ruse dux and they are so in depth and engaging as well. Overall I genuinely love sigma and they have taught me SO much like I'm actually confident about the hsc rn. I'm so sad tutoring ends next week .
But for an unbiased opinion, I would say physics at sigma and ace for chem. But for ace, try to get into the accelerated class.