Look at how you are performing in the secondary two exams. For a
better picture, look at only the exam results of SA2 and SA1 (for
subjects not taken in semester two), not the combined results.
I'm sure your school has set requirements for some subjects.
Young people like you may not understand it now, but eventually
all will appreciate that there is a cut-off.
Because some subjects are really only for the top secondary two
students. If you just nice can meet the mark, either exactly at
cut-off or within five to ten marks from cut-off, you may want to
avoid that subject.
The only exception is Additional Mathematics. Even if your
secondary two maths is around 70 or around 65, please choose
Additional Mathematics. A maths very important. Must take. Anyway,
some schools is every sec three express student take A maths,
regardless of their sec two maths results. If you can qualify to
take A maths, take A maths. If not, appeal to the school, ask your
MP for help, whatever. No matter what, must take A maths.
Whereas for Geography, be it pure or combined, this is only for
top students. I do not know about your school, but some schools set
their cut-off for geography very high (around 70). Because
unfortunately, lower sec geography is nothing compared to O lvl
geography. I myself took geog for O lvls last time, and I can tell
you, it is very hard. If your sec two geography not 80 (eighty) and
above, you better take another humanities subject.
After all, it's the L1R5 and the L1R4 that matters.
Choose the subjects which you know you will do very well in
them.
With regards to your question on whether to take Biology or
Physics, look at your exam results. If I am not wrong, secondary
one science is biology only.
You may want to see your SA2 exam results for secondary one
science, if it is biology. Compare that with your SA2 exam results
for Physics (the total score for Physics paper one and two). You
may want to choose the subject that has the higher score.