Exam

Minimum eligibility to apply in under-graduate course of Astrophysics:
Students must have studied Physics and Mathematics as compulsory subjects in the 10+2 level.
All the important universities conduct entrance examination in order to take students in undergraduate or post graduate courses .
Some of

If it is your first try, you may try for once more.

The qualifying marks in 12th for JEE Mains is 75%. If you do not get it, there's no use of giving JEE Mains.

Firstly look at the syllabus for your respective subject. Revise the basic concepts. Keep solving questions from different references. Every weekend sit for exams to evaluate tour preparation.

Hello,
GRE is the aptitude test for admissions into a masters degree program mainly in the United States. You have to register and schedule the test through the website: www.ets.org/gre
Check the same website for syllabus and test pattern.
Good Luck.

Hello Deepanshu,
I understand and appreciate your interest in pursuing Aerospace Engineering. To assist you in choosing the colleges to pursue the same, kindly refer to the link below for more information on the colleges:
https://www.shiksha.com/engineering/colleges/b-tech-in-aerospace-engineering-col

There are many coaching centres like :
Pratham (in Delhi and Chandigarh only)
Career Launcher
Law Entrance
many many more!
Just search Google for coaching near your area.

Don't loose hope, my friend. Some students forget all the concepts during exams so just chill, not everyone is getting admission in IITs. You should prepare for other college's entrance exams.
All the best!

Don't go on assumptions, just match with the answer key and if right then prepare for JEE Advanced because previous year's cut-off for SC category is 52.