hi,
see since you want to take admission in college with low fees structure you have to opt for government institute. aeronautical engineering of b.tech course are of four years duration. it would be best to study from government or iits or nits since placement is good and have excellent curriculum. I have mentioned some of the institute near delhi ncr, fees structure is 3-5 lpa in total.
Delhi Institute of Aeronautical Sciences
SOA - School of Aeronautics
Agra College of Management and Technology
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