Hello,

Based on the marks you provided, here's the conversion to Tamil Nadu state board percentile:

· Tamil: 75/100 = 75% ( percentile: 86-90)

· English: 59/100 = 59% (percentile: 64-68)

· Maths: 51/100 = 51% (percentile: 56-60)

· Physics: 61/100 = 61% (percentile: 68-72)

· Chemistry: 77/100 = 77% (percentile: 92-95)

· Computer Science: 97/100 = 97% (percentile: 99-100)

Note that the percentile ranks are approximate and may vary depending on the specific year and student population.

To calculate the overall percentage, you can add the marks and divide by 6:

(75+59+51+61+77+97)/6 = 64.17%

So, your overall percentage is approximately 64.17%.

Hope this helps,

Thank you