my son has a graduation degree in tabla as well will that b eany way helpful to him in bitsat

BITSAT is for the passage to a designing school and all things considered they don't consider some other parameters other than your imprints and placement test scores. While that degree will positively be an additional advantage in school co-curricular life, and may help in your CV and so on, it wont help for BITSAT.

BITSAT is for the entrance to a engineering college and as such they don't consider any other parameters other than your marks and entrance exam scores. While that degree will certainly be an added benefit in college co-curricular life, and may help in your CV etc, it wont help for BITSAT.