See if you have no subject preferences, then I would recommend you to go for the BITS GOA Chemical Engineering. The chemical engineering course have a much better job scope compared to that of Mechanical Engineering. Also the BITS GOA have a better placement rates which can really give you a good scope to get employed. Now Mechanical Engineering and Chemical Engineering both are core engineering fields but chemical engineering have a more job preference. If you know Mechanical engineering is one of the basic engineering sciences and there are a lot of applicability over the industries but still the mechanical engineering grads don't land good salary jobs. Also BITS GOA have a better infrastructure and faculties compared to that of MANIPAL. So factually, BITS GOA will be the most preferable choice for you.

To know more about BITS GOA visit the link below:

https://www.careers360.com/colleges/bits-pilani-goa-campus

To know more about Manipal Institute of Technology visit the link below:

https://www.careers360.com/colleges/manipal-institute-of-technology-manipal

To know more about Chemical Engineering visit the link below:

https://www.careers360.com/courses/chemical-engineering-course

To know more about Mechanical Engineering visit the link below:

https://www.careers360.com/courses/mechanical-engineering-course

I hope this answer helps. All the very best for your future endeavors!