I passed 12th PCM with 82% and I am taking a coaching for airforce. Which one is better: BA, B.Sc or B.Tech?

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As you are preparing for the airforce best is to do B.Tech, as it will give you the widest options in airforce. For B.Tech, you have to give the JEE exam or other state engineering exams. You can also do engineering from a private university. Don't pursue BA, as it limits your option to only CDS.