GATE

Hello Ankit, it's very nice to hear from you that you have prepared well for the GATE examination of 2021. Yes these days many PSU's do not conduct any entrance test but call candidates for interview of the candidates based on their performance in GATE examination. However these days almost all the employers talk of CTC and hence one should not talk of any individual perk or facility that is provided by any particular company since this all will be included in the CTC. Best wishes to you.

Hello Shailendra Singh, yes indeed. You are eligible to appear for GATE. But it's too late for GATE 2021. I am attaching a link that will give you all the required information. https://www.shiksha.com/engineering/articles/gate-2021-exam-blogId-31641
Best wishes to you.

One should score a GATE rank in 350-800 range to get admission in M.Tech.

Hello,
Astrophysics is really a specialized branch of physics and the knowledge of certain areas of physics is a must. Done your graduation in engineering in a civil branch which is not actually related to physics or definitely astrophysics. How to work to help you I am attaching a link that will give you all the required information about different eligibility conditions for the different courses that are conducted by the Indian Institute of Science in Bangalore. https://www.shiksha.com/university/indian-institute-of-science-Bangalore-22350/admission
Best wishes to you.