I took the SAT and did well. Most people still take the SAT. They say the ACT is considered equally, but it's actually not by a lot of liberal arts schools, because the SAT is a test on how you think and the ACT is a test on what you know. Most of what is asked on the ACT is stuff you're supposed to have learned in school, and there's a science section on it, while the SAT is all about trying to trick you and ask you strange questions and has an IQ component, so a lot of prestigious liberal art schools prefer the SAT because it has a reputation of being more 'intellectual', whatever that means.
I say this as the same type of person as your MC. My standardized test scores are really high and my essays tend to be great, but my homework... never... ever gets done.
Thanks! It's really fun. I'm not sure exactly how I'm going to contextualize families being sworn enemies and having heirs and obsessing over who marries who in modern society, but... I'll figure it out!