Hi Ankita,

You can change the grade level you are in and the courses you want displayed on your dashboard by going to your courses page on your profile. Then click the "Edit courses" button on the right side of the page. 

You should then be able to change what courses you have displayed on your course page. To change your grade level, click the "back" button in the bottom left corner of the Edit Courses window. 

I hope this helps! Please let me know if you have any further questions.