If you can't see your grades in just a few of your courses, your instructor might have turned off grades or has not added the grades tool for students to the course. If you can see your grades in a course when logged in through your computer's web browser, then you should be able to see your grades within the Mobile Learn app.
Your instructor needs to add My Grades to the course menu in Web Learn so that this tool is also available to you on Mobile Learn. You can also find a link to My Grades in the Tools course menu link, if your instructor has made it available there. If you cannot find a link to My Grades in Mobile Learn, contact your instructor. Your instructor can direct you to the correct location or add the tool to the course menu.