High Court jurisdiction preserved under Constitution, with prior restrictions on original revenue jurisdiction removed. Article 225 preserves the pre Constitutional scope of jurisdiction and the law administered by existing High Courts, subject to the Constitution and valid legislative enactments, and maintains judges' powers to make rules of court and regulate sittings as they existed immediately before commencement. A proviso removes prior restrictions on the exercise of original jurisdiction by High Courts in revenue matters and acts in collection of revenue, so those prior limitations no longer apply.