Since you’ve chosen UCSB for your TAG and have your classes aligned for that, do you think you could squeeze anything in for next semester that UCI requires as prereqs? If I were in your situation that is what I would do if you are wary that your TAG will not be approved. Regardless, there is no harm in applying even if you dont get all the classes you need for Irvine. I’m sure others will have something to say as well.