Parent Portal is a wonderful tool to keep track of grades, assignments, and progress for a student. You can find grades for each class as well as see what assignments have been given by each teacher.

http://omhs.omschools.org/modules/cms/pages.phtml?pageid=248101&sessionid=92c8e3184f8269fa294b24e303a2bb30&sessionid=92c8e3184f8269fa294b24e303a2bb30