College admissions in the United States refers to the process of applying for entrance to institutions of higher education for undergraduate study at one of the nation's colleges or universities. For those who intend to attend college immediately after high school, the college search usually begins in the eleventh grade with most activity taking place during the twelfth grade, although students at top high schools often begin the process during their tenth grade or earlier. In addition, there are considerable numbers of students who transfer from one college to another, as well as adults older than high school age who apply to college.