Hi,

The CBSE board has a best of five rule in which your main percentage is decided by one language subject I.e. English and other 4 subjects in which you get high scores. And the remaining subjects becomes additional whose marks won't be added to your main percentage.

The subject you would score lowest will automatically excluded . So, if you score higher marks in Painting than any of your subject other than English then it would automatically replace the lowest scoring subject .

So, your percentage should calculated by adding marks of English(Mandatory) , Physics , Chemistry , Biology and Physical Education . Let assume you scored lowest in physics it would be replaced by Painting.

Hope this will be helpful.