Yep it definitely will, however bear in mind that psychology has only two compulsory psychology courses in the first year, and they have to be done one per semester because only one course is offered in each semester although they are not a prerequisite for each other. Hence, all the six elective subjects you choose in your first year will not count towards your combined law/science degree besides any elective spots that is originally a part of the law/science program for students majoring in psychology.