Testing for Credit allows students to earn college credits by taking an exam without taking the actual course!  
Getting college/university credit for life experience is another way to get credits without taking specific courses.
Taking tests or applying for credit for life experiences allows students to skip the course. The credit goes on your transcript
without a crade. Your GPA (grade point average) will be based on the classes in which you actually enroll. 

Testing for Credit and Credit for Experience can help you save thousands of dollars and years of time. This is especially helpful
to those whose education has been interrupted for some reason. These strategies let you complete work more quickly, graduate
sooner and use time effectively at graduate or professional school levels.
The listings below are a starting place from which to find needed information. Keywords drawn from each of  them will lead to finding more.
7 Ways To Get College Credit Without Taking A College Class
How to Get College Credit Without Going to College Classes
You Can Now Get College Credit Without Ever Taking a Class
College Credit Without Taking a Course?
Jump Course: Earn Credit - CLEP, AP, & DSST or ACE CREDIT
Distance Education: Five Ways to Earn College Credit - Without Taking a Single Class