How to score practice exam

I gave my son the practice AP Gov test from 2008, how do I know what score he would have received. He got: 45/60 on multiple choice. He made 6/6 on the first essay, 5/6 on the 2nd, 1/5 on the 3rd and 2/5 on the last one. So what would that be??? A 3? A 4??</p>

Can anyone help me?</p>