Class subjects can only be updated from the admin panel of student portal so if you see invalid subjects for your class dont you worry about simply follow the steps
** Go to scheduling menu on left side bar
** In class tab enter the class name for which you want to update subjects. Name should be same as previously entered, Upper lower case not matters
** Choose subjects and tap or click to submit your subjects for the same class would be updated and previous would be deleted. Now enroll your students in new subjects
Solution
Solution
Solution