I think the short answer is "It Depends".
It depends on trade, career manager, who "owns" the courses being written off, lots of variables.
I've seen it go both ways. Med Tech, my former partner in the MIR not only got a recruit school bypass, she got virtually her entire QL3 (less PCP), and her PLQ 1-4 written off. I've also seen a former Royal Marine (with serious trigger time) get sent to BMQ again.
Don't feel poorly if you have to do it again, you'll (hopefully) shine on it, and you'll (hopefully) make some more friends for life on it, and (hopefully) not be the strange guy who came straight to the Regiment.
DF