Results in some core subjects could be lower due to more pupils being entered a year early, the watchdog says.
Bupa has held a contract to run the council-owned homes for 16 years.
Cledwyn building, which opened in 1937, originally housed a Welsh plant breeding station.
Glamorgan reach their first T20 Finals Day since 2004 with a comprehensive nine-wicket win against Leicestershire.
The Pro14's move into South Africa is just the start of the competition's expansion, with North America among future areas of growth, its chief executive says.
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