What are the educational qualifications required to become an Astronaut? Which entrance exam do I have to qualify and how can I prepare for it?

Respected Sir, I am studying in class 10th and I am about to appear for the board exam and after completing class 10th I have a dream of becoming an Astronaut. I want to know what are the educational qualifications required to become an Astronaut? Which do I have to qualify and how can I prepare for the exam? Should I join any Coaching Institutes? If yes then please tell me about such Coaching Institutes? Please answer as soon as possible.

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What are the educational qualifications required to become an Astronaut? Which entrance exam do I have to qualify and how can I prepare for it?

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