yes its a good combination Public Administration and Sociology are high scoring subjects. With a precise course. Criminology is interesting and involves case studies. I am opting for these 3 subjects aswell. You cannot go for criminology and constitutional law at the same time they belong to the same group. Stay with criminology. Go for Environmental Sciences since it will help in one of the compulsory courses General Science. And you are short of one more course. Choose wisely a 200 marks course atleast one in which u have some specialization. Like i will take Physics. Anyways Best of Luck.