Hello obi
Delhi university is one of the prestigious university of India and it's cutoff is usually high,  and specially for science and honors courses. The admission in DU depends on two factors..
1)  Your BFS percentage
2)  Your category
But,  as I said cutoff is very high,  so atleast a BFS of 90 is needed for general category to get physics Honors.
So a total percentage of 64.8% isn't enough to get your cousin a seat in DU,  no matter what your category is,  64.8 is too less to get a seat in Delhi university.

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