The University should be able to advise on what the next step is. Essentially, there are provisions so you can work up from an unsatisfactory grade. As long as your fiance takes on board the advice given he should improve and do much better on the next observation. As long as he shows progress then there won't be a problem. If your fiance is struggling at the school then I would question the school mentor and see if they are giving him the required advice. After all, they are the ones who know the school and they should be able to give him advice on how to control these difficult classes. I was at an inner-city school on my second placement (which was horrendus) but after each lesson my mentor was excellent and basically told me how to improve and control the class. After a few weeks his advice paid off and some of the really difficult classes were easy!