as a student i can confirm college doe not start at 1oth grade (year 11).
Year 1 U.K= Kindergarten U.S (funfact, the first kindergarten EVER in the U.S was in C.P
)
Year 2 = First Grade
Year 3 = Second Grade
Year 4= Third Grade
Year 5= Fourth Grade
Year 6= Fifth Grade
Year 7= Sixth Grade(JUNIOR HIGH SCHOOL)
year 8 = seventh Grade (Junior Highschool)
Year 9 = eighth grade (Junior Highachool)
Year 10= Freshman in High school (ninth grade)
Year11 = Sophmore in High school (tenth grade)
Year 12= Junior in High school (eleventh grade)
Year 13= Senior in High school
______= Freshman in College/ Uni
______= Sophmore in College/Uni
______= Junior in College/Uni
______= Senior in College/Uni
every year in highschool, students get state regents'. sadly students only need to pass only one to graduate. but at private schools its different
thats how it works in NY, other states its different