Your question: "I m currently studying in class 12th in CBSE and I want to pursue astronomy. Please suggest me what to do I f I want to get into astronomy.?" No one here necessarily knows what "12th in CBSE" means or cares. I am sure that asking here is a great waste of your effort.
If you are in a school, ask there or ask an astronomer. No one here necessarily knows what "to get into astronomy" means. I sure don't.
Maybe it means you are trying to sign up for a class. Maybe it means you want to be paid to do astronomy. Maybe it means you want to know more about astronomy.
If you just want to know about astronomy, you are asking at the wrong place. I am sure you can figure out how to learn more about astronomy. Read this article and go from there: "Astronomy, a natural science, is the study of celestial objects (such as stars, galaxies, planets, moons, asteroids, comets and nebulae) and processes (such as supernovae explosions, gamma ray bursts, and cosmic microwave background radiation), the physics, chemistry, and evolution of such objects and processes, and more generally all phenomena that originate outside the atmosphere of Earth.
A related but distinct subject, physical cosmology, is concerned with studying the Universe as a whole." • https://en.wikipedia.org/wiki/Astronomy Depending on what you are interested in and how much you want to know, you will need certain kinds of mathematics particularly related to physics, nuclear physics, and chemistry.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.