Can the provisions of Article 143 be derogated from by the clause (m)?
Yes, the provisions of Article 143 can be derogated from by the clause (m) as it states that neither the Supreme Court nor any other court shall have jurisdiction in respect of any dispute or other matter arising out of any treaty, agreement, engagement or other similar instrument relating to Sikkim which was entered into or executed before the appointed day and to which the Government of India or any of its predecessor Governments was a party.