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What do you mean nothing mentioned? Did they give you a blank piece of paper?
right, that's strange. were any exceptions applied that may have resulted in redaction of the information.
 
how i can address ,, purpose of visit , i choose my program which of 12 grade level in quebec as i am grdauate now i have applied in University for pg program and waiting for embassy response
Your purpose of visit does not convince the visa officer that you will leave Canada at the end of your temporary stay.

Since the visa officer cannot establish that you will leave Canada at the end of your stay, they cannot issue you a study permit.

https://laws-lois.justice.gc.ca/eng/regulations/sor-2002-227/section-216.html