What are the scopes available for me after completing Post Graduate Diploma in Computer Applications????

For getting government job after Bachelor of Science (BS / BSc), Mathematics you need to appear in the entrance examination of the government organizations. Following are some government organizations where you can apply for the job:

BSNL
ISRO
DRDO
ECIL
AAI
SAIL
RRB
UPSC
CDS
BHEL
MECON
FCI
NALCO
NTPC
IOCL
HPCL
Teacher

In private sector you can apply for following types of the jobs:

Mathematician
Actuary
Statistician
Software Engineer
Computer Systems Analyst
Physicist
Parole Officer
Meteorologist
Medical Laboratory Technician
Paralegal Assistant
Industrial Engineer
Accountant
Economist
Philosopher
Computer Programmer
Motion Picture Editor
Astronomer