1) Scanned Passport ( with all the stamped pages)(in a single pdf)
2) Letter of acceptance, official transcript, attestation letter from university about full time status ( in a single pdf)
3) proof of funds( remaining fees + available funds)(in a single pdf)
4) CAQ ( If in quebec)
5) Digital photograph.
6) IMM 5709 complete form
These are the required documents for applying study permit extension.