Geography

Best books are
-Arihant's UGC NET Geography (Rs. 520)
-Indian and World Geography (Rs. 374)
You can get them on discount or at cheap prices also.

I am not sure if the change of the course will be done after the 2nd year. Request you to contact the faculty or admission office to understand the process of changing the course.

After successful completion of the course, a candidate can get job as forest manager in economic and agricultural fields. Archaeology is also an exciting field in which a candidate can make his/her career. Government institutional offer a good job in the field of intelligence work and remote sensing interpretation. Many companies hire geography experts to work in waste disposals systems. Candidate can also go for civil services exams or choose a teaching profession after the course. Some of the major recruiters that hire geography majors are:
ISRO
NRSC
NATMO
Survey of India
Tata Chemicals Ltd. Bayer
Eureka Forbes.

Please refer the link to get an idea:https://cbseportal.com/Bihar-board/papers/class-12-model-paper-geography.

St. Xavier's College, Mumbai does not offer BA in geography.

Yes, based upon your %, there are chances of getting admission but I suggest you to keep a watch on the cut offs released by the official University of Delhi's website i.e. www.du.ac.in.

Yes, you are totally eligible for the same. Yes, Absolutely you can get the Geography Honours Programme without having mathematics.