Is getting 800 on Chemistry and WH strong enough for Harvard?(International)

Hello.
I live in a country where SAT and ACT are not offered,so,I have to go abroad and take them.
Since it’s the only time I can go ,and considering that I want to have a good efficiency on the test ,and the pressure which may be existed in a foreign country on me during the test,regardless of courses I have passed in my high school,do you think that whether these courses are strong enough to show my academic ability to Harvard by getting 800 on both of them?
I mean,the type of them,for example in compared with Math 2 or Physics.

-So,what’s your advice guys?

See my answer in the other thread you started on “what are my chances”

No need to repeat answers from your other thread.