You seem to have posted a lot of threads with approximately the same content in them. Many of these questions can be answered by looking at the school’s website. For the dress code, look at the school’s student guide/handbook. For questions about JV/Varsity teams, look at the “Athletics” section. For questions about student life, dorms, and campus, see the “Student Life” or “Residential” section on the school’s websites. To see the languages you can take, look at the “Academics” section.
I would also recommend using the search tool above “Search Forum” by entering in the schools you are interested in and also testing out “[[School Name]] CollegeConfidential” on Google–you may find some of the answers you are seeking already there.
There is no set grade or SSAT percentile admittance. Plenty of 4.0 GPA, 99th percentile SSAT kids were denied admission. Grades/SSAT is only one small part of the package, and schools look at the entire package.
This question honestly scares me because no one should just take a course in order to have it “look good on their application.” Take the courses you love and want to take. Don’t take a course to show off to colleges/BS.