Hi NaiveGiganotosaurus556,
Thanks for your question! 😎
Usually not, you need to have done STE and SN in fourth year secondary to be able to respectively take chemistry and physics and maths SN in fifth year secondary.
However, additional courses are sometimes offered, depending on the school.
I suggest you consult the guidance counsellor at your school for more support.
If you need more help, don't hesitate!
Have a good day 😊