Can I take CM 3110 at the same time as (or before) CM 2120? Published January 11, 2012 By Courses Registration No. CM2120 a prereq to CM3110. If you need to take CM3110 in the fall, then you will need to arrange your schedule to take CM2120 first. CM 2120 is offered in the spring and in the summer, track B. prerequisites, summer, waivers ← Previous Post Can I retake a class? Next Post → Can I drop my class?