apenguinstudies I'm in QCE and here you MUST do Methods with Specialist, so I'm sure that's the same case for you. There's a very good synergy between the two subjects and your ATAR will skyrocket if you do well.
I think 2 sciences is enough, since bio especially is good for clinical work but idk (I'm doing Physics and Chem). As a whole, Methods is the better choice imo, so do that instead of psych or replace chemistry. Don't look at this as advice but just my opinion hehe.
P.S. You're in yr9, so don't stress! Enjoy this peaceful school year and enjoy the time with your friends! Nothing to worry about rn... 😀