When Do Students Take Their Sat & Act Tests? What Is The Point Of These Test?

I’ll be a Freshman this year and I was curious. I want to prepare.

Is The Point Scheme On The Sat Subject Test Similar To The Sat Reasoning Test?

I know that on the Reasoning Test, you gain 1 point for every right answer, you lose 1/4 point for every wrong answer and you lose no points for omitting the question. Are the subject tests scored a similar way? Is there anything particularly special about the way they’re are scored? Thanks in advance.