The whole city is unified.

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See:

Notice of Beijing Education Examinations Institute on Doing a Good Job in Enrollment of 20 14 Beijing Ordinary Senior High School Examinations

The examination subjects are Chinese (120), mathematics (120), foreign languages (120), physics (100), chemistry (80) and physical education (40), including 30 on-site examinations and 650 process examinations. Out of 580 (excluding addition and subtraction).