I don't know about which course you are applying for. But you must be sure that you include the mandatory subjects as per the university norms in your best 4 and apart from that the remaining subjects you can give any. For example if you wish to go for Physics then you must include the marks of Mathematics as it is a compulsory parameter.

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https://dqxeclau.top/university/bharat-ratna-dr-br-ambedkar-university-delhi

I hope this helps.