I would suggest that if you are offered a course you take it (if it is the base you want, ofcourse
)
I don't think all you new joiners quite understand that EVERYTHING in ba is seniority based. So the longer you put it off the lower your seniority is.
Just a thought but when you eventually join it will become crystal clear and you'll kick yourself for not having joined sooner.
Good luck and congratz to you all though.