Forgot to list university on CSU application

To make a long story short I forgot to list UCSD as a school I attended I was a CCC transfer student to UCSD but due to a number of circumstances, I thought I was going to drop courses and transfer somewhere else next year. The college changed its withdrawal date two weeks back and I submitted my CSU application with the intention of never taking courses at UCSD. However, I was told that since I missed the withdrawal period that I could only get F’s in the courses, so I decided to stay and finish the Fall 2019 quarter. I was dealing with so much stress that I completely forgot about my CSU application until just now that I’m getting responses. What can I do? I’m scared that they’re going to rescind my admissions

All you can do now is contact the schools and let them know of the mistake. Better to find out now what you need to do to keep your acceptances vs. being possibly rescinded in the summer after you send in your transcripts and have no other options.

@Gumbymom Ok that’s what I did but for example, one school (CSULB) just reiterated the point for me to send the transcripts I listed on my application and ignored the fact that I told them that I forgot to list UCSD. In that case, what should I do? Just follow their instructions?

Yes, follow their instructions.