Hi Swetha,

Astrophysics is not a subject which your should study by distance learning program,you should must go to university for regular classes.Some good colleges in Kerala for Astrophysics are:-

1-Cochin University of Science and Technology ,Kochi.

2-Indian Institute of Space Science and Technology - Thiruvananthapuram, Kerala.

3-Jawaharlal College of Engineering and Technology,Kerala.

4-Vikram Sarabhai Space Centre ,Thumba, Thiruvananthapuram, Kerala.

5-Pondicherry University - Pondicherry (Mahe), Kerala.

6-National Institute of Technology Calicut - Calicut, Kerala.

7-Kerala University - Thiruvananthapuram, Kerala.

Hope this will help,please feel free to ask if you have any further queries.

Thank You.