Hi
No, you can't include Arabic as a general elective subject for the calculation of your 'Best Four' percentage.
Yes, you must include 1 language and 3 elective subjects for the calculation of your best four percentage and the subjects has to be chosen from the List A and List B respectively which is already set by Delhi University.
To know about calculation of your best four percentage, kindly refer the link provided below -
https://university.careers360.com/articles/delhi-university-admissions-how-calculate-best-of-four-marks
Thanks
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