PGCE secondary subject

I'm in my third year studying Sociology at University and am going on to do my PGCE next year in secondary education BUT I am a bit stuck between choosing psychology or RE as my subject specialism. I have interviewed for two courses to teach psychology and one rejected me based on my low subject knowledge. I have an A Level in psychology but due to covid my SK is a bit patchy. The SCITT who rejected me suggested I apply for RE instead as sociology is linked. I was initially going to apply for RE but didn't as I don't have an A Level in the subject.
I am doubting my decision for psychology as it is a really hard subject to teach and the bits I struggle with I am going to find so hard to teach, even if I work on my SK in my own time.
If i decide to choose RE do I need to apply again for this subject? Or will the University of Worcester (if they give me an offer) just allow me to transfer over to a different subject specialism?
I really don't want to have to interview again!!

Hello,not to hurt your hope but being an RE teacher is not a good subject to be,it's difficult to find jobs for being an re teacher as the schools usually just take a teacher from other class and done. I will encourage you to go for psychology or even sociology,both subjects that need a proper teacher with a degree on it