After 10th,  you can do diploma in Aeronautical engineering which will be a 3 year course after which you will be able to join another 3 years btech course in aeronautical engineering. The cutoff depend and varies from college to college. In general if it's 10th, try to get above 85% only. And the other option with you is just take science in your 10+2 and then give entrance exam JEE OR cet and go into btech course aeronautical engineering.

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