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Sorry Dear, In any of the University of Delhi College , for maths honours course no one can take Physical education as a fourth subject in best four subjects.
You can include English subject in best four subject.
English, Maths, Physics, Chemistry can be the subjects in best four.
I hope its clear.

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Hello Malvika, I must say that you have obtained a reasonable good rank. Therefore I feel that you should get the college of your desire. However to help you I am attaching a link that will predict the college that you can get based on your performance in this examination. https://www.shiksha.com/engineering/ts-eamcet-college-predictor
Best wishes to you.

Hello Sai Vishwas, in India, what you are seeking is dealt by two different agencies. Indian Army is the user of weapons, it does not indulge in research & development, though of course it decides what it desires, keeping in mind what our adverseries have. DRDO is the organisation in India that develops different types of arms and ammunition. You can join Indian Army after your graduation in mechanical engineering. Just Google "join Indian army" and you will get all required information. Also DRDO inducts fresh graduates every year for their different labs. You just need to keep tab on advertisement. That's all. Best wishes to you.