Hi Aspirant,

Some of the best colleges for astrophysics in India are:

• Aryabhatta Research Institute of Observational Sciences, Nainital: Astronomy and Astrophysics, and Atmospheric Physics.
• Homi Bhabha National Institute, Mumbai
• Harish-Chandra Research Institute, Allahabad:Theoretical Physics, Astrophysics
• International centre for theoretical sciences (TIFR), Bangalore
• Indira Gandhi Centre for Atomic Research, Kalpakkam
• Indian Institute of Astrophysics, Bangalore
• Indian Institute of Science, Bangalore
• Indian Institute of Science Education and Research Bhopal
• Indian Institute of Science Education and Research Kolkata
• Indian Institute of Science Education and Research, Mohali
• Indian Institute of Science Education and Research, Pune
• Indian Institute of Science Education and Research, Thiruvananthapuram
• Indian Institute of Space Science and Technology, Thiruvananthapuram
• The Institute of Mathematical Sciences, Chennai
• Institute of Physics, Bhubaneswar
• Institute for Plasma Research, Gandhinagar:
• Inter-University Centre for Astronomy and Astrophysics, Pune
• Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore
• Raja Ramanna Centre for Advanced Technology, Indore
• Tata Institute of Fundamental Research, Mumbai

Hope this helps.

Good luck!

Dear Shalini, here you go:

IIT Bombay

IISc Bangalore

IIT Madras

IIT Delhi

IIT Kanpur

Tata Institute of Fundamental research

Delhi University

IIT Kharaghpur

IIST Trivendrum

India Centre for Space Physics, Kolkatta

Savithribhai Phule Pune University

Cochin Institute of Science and Technology

Indian institute of Astrophysics, Bangalore.