Paper was similliar in difficulty to last year due to weird questions and weird answers for the calculations (which I thought where originally wrong but glad I never changed them because by the looks of it they were right) so A will probably be around 56/57/58
For CHEM1 the required UMS for an A Is usually 54-56, I think there was some questions that could have easily caught people out there so I think 57 for an A.