Hi, 

     Yes definitely you can do after 12. You should have passed your +2 with physics, chemistry, maths.

Here's top colleges :

Osmania University, Hyderabad 

Punjabi University

Andhra University 

Andhra University college of engineering and technology 

Hi Bharath,

Very nice choice. Yes, astrophysics and astrology are different.

Astrophysics is the application of physics to understand astronomy.

Astrology is the study of the motion of celestial bodies and their influence on living and non living things.

Yes, after 12th with PCMB you can take up graduation in this field.As physics is the base for this field to choose as a career. Your physics should be strong with all subjects,you have taken.

Your admission will be on merit base only. 

Some Colleges providing the course:

-Bhartic institute of vedic astrology, Delhi

-School of aviation science and technology, Delhi

-Indian Institute of aeronautics, Patna

Best wishes!!!