State Government
Subject to the Constitution and relevant laws, an existing High Court's jurisdiction, the law it administers, and its judges' powers (including making court rules and regulating sittings) remain the same as immediately before the Constitution's commencement - except that pre-Constitution restrictions on revenue-related original jurisdiction no longer apply.
This is a continuity/transitional provision ensuring High Courts that existed before 1950 carried forward their existing jurisdiction and powers into the new constitutional order, with one specific liberalisation: old restrictions on hearing revenue-related cases were lifted.
This kind of provision smoothed the transition of colonial-era High Courts (like the Calcutta, Bombay, and Madras High Courts, some of which predate independence by decades) into the new constitutional framework in 1950.