BEL- Bharat Electrics Limited
BHEL- bharat heavy electrics limited
HAL- Hindustan Aeronautics Limited
NAL- National Aeronautics Limited
DRDO- department of research and development organisation
ISRO- indian space research organisation
ITI- Industrial technology institute
IISC- indian institute of science
NCBS- national centre for biological science
UAS- university of agriculture science 
71 4 71
pls!! mark as the best
how you got 1700+points for just 240 questions