Hey,
I can't offer any advice on RST3A since I'm not sitting it, but I am doing religious experience in RST4A.
As far as that goes, I'm not sure on solid predictions, but it seems by looking at past papers that there is always one 45 marker that's based more around what religious experience is (eg. Describe how a religious experience could be seen as a mystical experience and a conversion, or, What is meant by Religious experience?) or how you can verify a religious experience. These questions are pretty self explanatory, as long as you have a knowledge of mystical experience, conversion, revelation and visions along with how to verify them you should be good to go (knowledge of the different types of religious experience but forward by Swinburne and Franks-Davies is also useful) . The other type of 45 marker is usually along the lines of how religious experience has been used for the basis of a religion, or good religious behaviour. So, that's what's likely to come up across the 45 markers.
The 30 markers are a little bit harder to spot patterns in, but they usually link in with the 45 marker so if you know your stuff for the 45 marker, the 30 should be OK.
How are you feeling about this exam? I'm pretty worried for it due to the lack of a solid textbook to work from. Not sure if what I have in my notes is sufficient.