Hi Suraj,
Top 20 percentile is calculated by taking into account FIVE subjects-
Now, the total is calculated out of 500 marks obtained in the aforementioned FIVE subjects and a list of top 20 percentile is prepared by the respective Board and sent to JoSSA.
Here is the 2019 cutoff of Top 20 percentile of UP Board-
1. General- 334
2. OBC- 326
3. SC- 315
4. ST- 314
5. PwD- 314
Hope this helps you.
All the best!!!
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