Hello Aspirant
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For IIT and nits and other universities you should better go for jEE mains and advance exams.
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The  entrance exams for aerospace and Aeronautical engineering:
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All India engineering/architecture entrance engineering.
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Delhi university combined entrance examination.
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Hindustan university entrance test.
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Iisat admission test.
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Jee (joint entrance exam) conducted by IIT.
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Sliet entrance test (set)
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Indian institute of aeronautics(iia) entrance exam.
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SRM engineering entrance examination (SRM EEE) Admissions.
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If you have any questions further let me know.
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Thank you!!!!