Pariksha...a real test....solve it

Solve it

It is a 9 letter word- 123456789.        
If u lose it you die.
If you have 234, you can 1234.😀
56 is one type of disease.
89 indicates exact location & time,  
2&7 are same letter, 3&8 are same letter, 5&9 are same letter...                                                   ...guess the word!

Challenge for all masterminds!!

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Ek aur questn.
Wo kya cheez he jo saal me ek baar,mahine me 2 baar aur din me 4 baar aati he.