Many people due to personal reasons can not attend regular classes and go for distance education. Regular classes have their own advantage but if one can study oneself, distance education will also be purposeful.
As regards Maths, there is absolutely no problem as it is a theoretical subject and you can go ahead with the help of tutorials and notes sent by the institution. Pursuing Maths with distance education is a viable option.
Coming to Physics, it is a subject of great understanding and is incomplete without practical. You will have to find out the correspondence institutions which are arranging for practical sessions.
There are many universities in India all across the country which offer this course and some of the reputed ones are -
Nalanda Open University, Dr BR Ambedkar Open University, Annamalai University, Madurai Kamaraj University and Madras University.
Knowledge is power.