Look for example
If you applied for CAQ for fall 2020
And you got it
It is mentioned in the letter
You can use to apply for Study Permit for
Fall 2020
And
Winter 2021
After that
You need to apply again for new CAQ if you want to apply for study permit in Fall 2021
Regardless of the Validity of CAQ which might be for 2 or 3 years
And that what was written in both my CAQ
I advise you to call
Their call Centre
And they will help you
I requested the CAQ twice before
And
I used to call them many times
They speak English
They are very helpful