GATE Scores

GATE cutoff depends upon the opted specialization and category you belong to. However, a GATE score above 700 can be good enough for top IITs.

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.

Both entrance scores are acceptable for M.Tech admission at Anna University. The eligibility criteria is given below. Eligibility : Candidates who have passed all the subjects in the recognised Bachelors Degree or equivalent
field and obtained at least 50% (45% in the case of candidates belonging to reserved categories) in the qualifying degree examination as per AICTE norms are eligible. Further, the candidates shall possess
I) T A N C E T 2020 percentile score (or)
ii) GATE 2018 / 2019 / 2020 qualified score in the appropriate discipline of Engineering / Technology.

Hello Kshitiz, these days many institutions prefer GATE ranking for giving admission to postgraduate courses. Hence MTech in data science also would be available in many institutions across India only after student has cleared his GATE examination.
Best wishes to you.