Piggy You sound like you are feeling as despondent/deflated as I was with my son’s mock results. 
We’ve just had a fairly positive parents’ evening with all his tutors seemingly confident that he can do well (🙏). They obviously see a different side to him than we see at home. It does seem as though his biggest crash and burn was the first mock exam he sat, before which he was incredibly stressed and anxious. His results then improved as the exams went on and he relaxed into it/gained confidence, so we are definitely going to look at working around that for his actual exams.
Other than that, he’s probably going to firm his original first choice (Sheffield) and insurance will be Leicester or Manchester and take it from there. We’ve collectively decided to believe that wherever he ends up must be where he’s meant to be. (Gin helped enormously!)