The following instructions are copied from CSUMentor instructions for High School Preparation under the heading "Advanced Placement Tests".
"If you have not completed all of the required number of subject matter course units in Mathematics, but you have earned a score of three (3) or higher on an AP Test in Mathematics, you may enter the test for subject matter credit in Area C. Select the institution you attended when the test was taken. Select the grade level and year the test was taken. Select the course title "Other" and enter "AP Exam" and the exam name in the course title field. Example: "AP Calculus". Select the Semester term type. Enter the number of semesters of course credit that you lack, up to a maximum of six (6) semesters of credit, and select 'Pass' for the grade in these semesters. "
My son did this for 3 AP Tests when he applied to Cal Poly. His senior year of high school he did not take English or Government, but at the end of his junior year he took the AP English Language test and AP US Government test. He scored a 4 (English) and a 3 (Gov) and he reported these on his CSU Application in the section where you list your A-G courses. He listed:
AP English Lang Exam PASS
AP US Gov Exam PASS
AP Chemistry Exam PASS
He could have listed AP Chemisty as a course he took his junior year, but chose not to list the course because he made a "D" the 2nd semester. Since he passed the AP Chem exam with a "4", he just listed the exam on the application instead of the course.
He was accepted regular decision.