If you can find a copy of the oxford study buddy from your local library or any library, it'll help, and especially concentrate on the questions your teachers give you. For Chem, specifically redox, Tyler Dewitt explains it really well.
I got 5/10 's for both FA1's for phys and chem, and I worked hard and I got 7/10 and 10/10. Don't be scared, believe in yourself 🙂
The ATARNotes guides are also very useful. Check your textbook if it has anything.
This is useful for physics:
https://atarnotes.com/physics-data-test-advice-qce/
You've got this,
-jinx_58