If it is regarding educational qualification then you are certainly eligible to pursue the course from any school/college in Maharashtra or for instance anywhere in the world if your academic qualification and grades holds the criteria and eligibility for that particular course or degree.

But, if you want to get benefit of the state quota system for admission, you need to have the domicile certificate of the same state from where you want to get admission. 
A certain number of seats are reserved for SC/ST and OBC, as well as for the candidates from the same state where the campus in located.

You do not need to procure any other caste certificates from any other states, if you already have one.

Hope this helps you.