are you looking for primary or secondary school net?  for secondary Kowloon City school net includes Mongkok, Kowloon Tong, Homantin, To Kwa Wan.  For secondary you many look at school net 41 which post above

For secondary you may consider Homantin like Sheung Shing Street or Perth Street.  Age around or below 30.  Quiet and surrounded by Band 1 schools.