How to generate a students report card in crystal reports

Am developing school management system using windows forms (c#)  and sql server database.am now on the stage of generating reports,my application can generate report cards for sub exams i.e Test1,Test2 and Test3 .My challenge now is to generate a general report card for all tests using crystal reports,so it should be the sum of all the tests and it should rank students basing on the totals.How can i achieve that?.