After delaying it for some months I finally got it done! My single piece of advice for preparation: get HFEJB and DO AS MANY MOCK EXAMS AS POSSIBLE (ok that's two). Mock exams are just great, you don't only learn stuff but some questions can be very similar to the real ones.
I didn't know you can't revisit the drag and drop questions without loosing your original answer. That surprised me a bit. Since I wanted to double check my answers there I had to do them again. Not a big drama coz the time given is enough ...