To graduate in four years, students must take and pass at least 15 credits a semester. What is pretty a lot for students and some people cannot afford it. Some people fail their classes, so they have to take them again. That's why four-year graduation rate is 33.3%. Some people think that four years is not a lot ,so they decide to take a break. Otherwise students who's taking six-year college know that they a lot ofyears left, so they are trying to finish it as soon as possible. Let’s talk about the factors in low graduation rates. First factor is going to be Income-related issues. One of the largest factors is being a family and personal income. If a student cannot continue paying for college, they may have to drop out completely or put their education on hold, quite possible for years. That way they can go to work to supplement the family income or even because the student provides the sole financial support for the family. Other students may drop out to assume childcare