Hello Aspirant
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The eligibility for aeronautical engineering is 50% marks in 12 class( mathematics, physics ,chemistry) or the students should complete the diploma in aeronautical engineering or mechanical engineering.
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The fees structure varies from College to college. For some Colleges under comedk is around 6 to 7 lakhs and for government Colleges is ranges between 3 to 4 lakhs for four years. For private universities like lovely professional university the College fees or four years is around 3 lakhs per year.
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Top colleges offering Aeronautical engineering in India:
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• MIT world peace university Pune
• Lovely professional university
• Manipal institute of technology Manipal
• Madras institute of technology Chennai etc

If you want to know more aeronautical Colleges once visit this below link:
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https://engineering.careers360.com/colleges/list-of-aeronautical-engineering-colleges-in-india
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For scholarship it is based on College cutoff rank and you category. For example in America the American institute of aeronautics and astronautics provides higher education funding for student members.
If you have any questions further let me know.
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Thank you!!!!