The application process is highly convoluted and not very well designed. Some people just fall through the cracks. But yes, also a small number of people just

The application process is highly convoluted and not very well designed. Some people just fall through the cracks. But yes, also a small number of people just don't have the intellectual ability to handle it, although schools do a lot of screening to minimize this. Graduation rates at schools are typically 100%, with maybe 1 person every other year failing out.