Hey Kush,
You can crack all the exams you wish to without any coaching for sure. All you need to do is focus on your goals.
Going to coaching doesn't help if you don't study at home afterwards. I am myself going to coaching for GATE Exams. But regardless of that, I have to study at home for my exams.
So don't worry about this, just work hard for what you want.
Now about, Astronomy scientist,
For that you will have to complete your graduation and you will have to complete 12th from science stream.

• Eligibility criteria for becoming Astronomy scientist is that you have to be a graduate in B.sc or any equivalent examination with 50% score.
• After 10+2, you can do B.sc with mathematics and physics as your subjects.
• If you want to pursue experimental or instrumentation astronomy, then you can go for electrical engineering after 10+2. Then you will have to give an entrance exam called JEST which will make you eligibile for specialisation in astronomy and you can also do Ph.D. To become an astronomer, Ph.D. is compulsory.

Many colleges may take their own entrance exam.
Hope this helps!

Hello,
As we all know that competition in JEE is neck to neck. In this scenario one should always prefer coaching because of following reasons
1.It gives u the deep knowledge of subject.
2.You cannot clear ur doubt by yourself you need some kind of tutor.
Don't feel bad but considering ur marks and ur future goal u should take coaching.

Hello kush.
Anyone who is having strong determination and dedication can get whatever he wants, you too. Just start focusing on your basics and follow NCERT books and syllabus you will surely succeed. From the previous year question papers you can get a rough idea of important chapters also. Hope you are getting me.
Good luck

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