If the course you want to take is COLWRIT R4B, then yes, you absolutely must fulfill the prerequisite first semester of R&C before enrolling in the course.
For courses other than COLWRIT R4B, the answer is almost always yes, you must fulfill the prerequisite. You may contact the instructor to ask for an exception, but expect to be told that you need to fulfill the prerequisite before taking the course. Even if CalCentral allows you to enroll in the course, the instructor will likely drop you if you haven’t fulfilled the prerequisite.
Yes. You can enroll in an R&C Part B course for next semester. If you pass COLWRIT R1A at the end of this semester with a C or better, you are allowed to take the R&C Part B course that you enrolled in. If you don’t pass COLWRIT R1A at the end of this semester, you are not allowed to take the R&C Part B course that you enrolled in, and you will have to drop yourself from the course.
If you're enrolled in COLWRIT R1A in the spring semester and want to enroll in an R&C Part B course during the summer, contact us if you have problems enrolling.
