<p>In general such a student will be at a disadvantage, even with a very strong academic record. Because of the intensity of its undegraduate education, MIT is going to be very concerned about the level of emotional and intellectual maturity of a student that applies a year early. While a year may not make a lot of difference in maturity at 25 it certainly does at 16 or 17, particularly if you have to deal with a lot of stress. There would have to be some very compelling reasons for MIT to admit a student that skips senior year. Having exhausted the advanced classes at his high school would not be a sufficient reason. The student can always gain additional experience by taking courses at a local community college or university, get involved in research, take a part time job. If he has won the USAMO it may be a different story.</p>