Govt. Exams
Entrance Exams
This idiom means something happens very rarely or almost never. A blue moon occurs approximately every 2-3 years.
'Hit the books' is a common idiom meaning to study hard, especially used by students.
The idiom means heavy rainfall. Option B correctly uses it in context.
This idiom means working late or studying hard, often for exams or important work.
'Break the ice' means to initiate conversation or ease tension in an awkward situation.
Bite the dust means to be defeated, fail, or die. It's commonly used in competitive contexts.