Count fileds in 2007 access form

[Johhny Walker]

I created a form in access and need to total some of the boxes for a final total in the last box which will appear in a report. The fields are a number rating for each box and I need access to count and total them. If it matters the fields below are not in order on the form. Thanks

A-Rating
B-Rating
C-Raiting
Total #

I also have four seperat reports that I need to show together and print with one action instead of opening and priting each one seperately