There are many Jobs a person can do after doing Post graduation in Mathematics.

1. Teaching Profession : About 85% of the Indian who do PG in any subject ( Science, Arts or Commerce) opt for this profession.This profession has respect as well as money.
2. Phd : Some are aspiring to be a future research fellow so after Msc they try to qualify UGC NET, SLET (North-Eastern States) , RAT (Institutional entrance test. This exams are considered as one of the toughest and most prestigious exams in India. After qualifying this tests they can go for Phd in any institute they apply after undergoing some of the particular Institute admission procedures.

• There are some other sub parts of this point NET has 2 cutoffs . One is for Normal qualifying mark and another is JRF (Junior Research Fellow) qualifying mark.
• After JRF , If the Institute is satisfied with your research work they give accommodation to SRF (Senior Research Fellow).

You can also give other exams for jobs like UPSC, SSC etc for government jobs.

These are some of the paths.

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