Tens of thousands of high school seniors will graduate this week across North Carolina. In a few months, many will start college. Not only will that be the next step in their educational lives, but also the end of a college search process that, for some, took years. It’s a process that has gotten more and more complicated, both for students and for the people who read the college applications. The rapid expansion in the number of high schools in the state is having unintended consequences in college admissions.