The Senior School can be found on City Walls Road:
Find the Senior School using a map from streetmap.co.uk
The Lower School can be found on Liverpool Road:
Useful Info 
Location
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7:32pm - 16 Aug 18RT @ChesterChron: It's been another great A Levels year for @TheQueensSchool in Chester: https://t.co/jeSuVzMBmJ
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5:14pm - 16 Aug 18
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4:59pm - 16 Aug 18RT @QueensSchoolPA: @TheQueensSchool join us in thanking teachers & staff @TheQueensSchool for their enthusiastic teaching & dedicated… https://t.co/5B20Jo6xij