JEE Advanced

Hello,
Please use Shiksha's predictor to find a good college:
https://www.google.co.in/url?url=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&rct=j&sa=U&ved=2ahUKEwi7xLvrj4DcAhVEvo8KHX1bB0QQFjAAegQIARAB&q=sissha+college+predictor&usg=AOvVaw2XP_zVyb0ocLS8jQERCtIp

Hello
Please use siksha predictor to find a good college
https://www.google.co.in/url?url=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&rct=j&sa=U&ved=2ahUKEwi7xLvrj4DcAhVEvo8KHX1bB0QQFjAAegQIARAB&q=sissha+college+predictor&usg=AOvVaw2XP_zVyb0ocLS8jQERCtIp.

Yes, definitely you can opt astronomy after JEE Advanced and there are some IITs offering these courses with better career and research opportunities.

Hello
Here I mention a link given below please visit on it
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&ved=2ahUKEwjGue-Wh_vbAhUK6Y8KHVA9D1kQFjAAegQIAxAB&usg=AOvVaw1N9BzFtyUCP4JU-2UQHQ0H.

Till now there is no need of the class 12th report card and when you need that till then it will be in your hand so don't worry and just focus on the JoSAA counselling.

Yes, you can get into one.

With this rank in JEE Advanced 2018, you can get a seat in IIT-Indore or IIT-Baroda or IIIT Raipur.

Prefer any coaching printed booklets or hend written notes, for reading and prectice questions, and ncert must read.

Well, it's a good decision that you have your goal clear at this point i.e. class 10th.
Well, cracking JEE Advanced requires a lot of dedicated work from day one.
For that, you need to clear JEE Mains first. And for that, you need to focus more on class 11th and 12th.
So now you know that it's not a one-day task but a long way to go through.
In order to crack JEE Advanced and secure a decent rank, you need to join some coaching institutes for help.
The rest is self-study and hard work.