I am no immigration expert, but know more than I did a year or more ago. People who get deported are generally in one of 2 groups: 1. They commit crimes, other than entering the country illegally or 2. They work for an employer that is found to have a large number of illegal employees. Our son-in-law is working with immigration. He is attending BYU.
He entered the country legally, but outstayed his visa. Immigration treats those that enter the country legally differently from those that do not. He has that as a plus. If you enter the country legally and marry a citizen (our situation) it is very rare that if immigration believes that the marriage is real that you have to wait more than a few months for a green card. Actual citizenship may take much, much longer, but being back to legal status is usually only a few months. That will allow him to work and continue school without worry, hopefully before 2018.
If BYU knows that you are not here legally and you are not working with immigration on an application or an appeal they may not let you continue with classes on campus, but force you to switch to on-line.