Correct Answer: Geography

Solution : Given: Full marks = 100
Total subjects = 6
Total marks = 100 × 6 = 600
Marks obtained in CS = 95 + 90 + 80 + 85 + 80 + 90 = 520
Required percentage = $\frac{\text{marks obtained}}{\text{Total marks}}\times100$
= $\frac{520}{600}\times100=86.66$%
Marks obtained in Physics = 65 + 70 + 80 + 90 + 95 + 90 = 490
Required percentage = $\frac{\text{marks obtained}}{\text{Total marks}}\times100$
= $\frac{490}{600}\times100=81.66$%
Marks obtained in Chemistry = 90 + 75 + 65 + 85 + 95 + 90 = 500
Required percentage = $\frac{\text{marks obtained}}{\text{Total marks}}\times100$
= $\frac{500}{600}\times100=83.33$%
Marks obtained in Maths = 70 + 75 + 70 + 75 + 85 + 95 = 470
Required percentage = $\frac{\text{marks obtained}}{\text{Total marks}}\times100$
= $\frac{470}{600}\times100=78.33$%
Marks obtained in History = 70 + 85 + 90 + 90 + 90 + 90 = 515
Required percentage = $\frac{\text{marks obtained}}{\text{Total marks}}\times100$
= $\frac{515}{600}\times100=85.83$%
Marks obtained in Geography = 80 + 85 + 95 + 95 + 95 + 90 = 540
Required percentage = $\frac{\text{marks obtained}}{\text{Total marks}}\times100$
= $\frac{540}{600}\times100=90$%
The overall percentage is highest in geography.
Hence, the correct answer is Geography.