CBSE Rules to Change Subject in class 11 or 12

CBSE has updated the rules for changing subjects in class 10 and 12 in the year 2019. New rules are available here:

CBSE Rules for Change in Subject :

Change of subject(s) in class XI may be allowed by the Head of the School but not later than 31st October of that academic session.
No candidate shall be permitted to change her subject of study after passing Class XI.
The candidate shall not offer a subject in Class XII which she has not studied and passed in Class XI.
Notwithstanding anything contained in the rule (2) and (3), CBSE Chairman shall have the powers to allow a change in subject(s) to avoid undue hardship to the candidate, provided such a request for change is made before 30th August.