Hi vishal,
I believe the VO's concern here is specific that the applicant (being an English teacher) doesn't have an
excellent score in an English exam..u know not just good but great..and hence the concern whether he will be able to make it in the Canadian employment market...
I suggest your friend do the following immediately-
Ideally retake IELTS/CELPIP...but since the VO has given only 30 days' time this is likely not feasible...Hence he should appear for the 2 other internationally-accredited exams-
a) TOEFL or b)PTE Academic
Tell him to drop everything else for 10 days, prepare for the exam and get an
excellent score..Submit the scores to VO also reassuring that he is also ready to retake IELTS anytime and get a better score (and if he had any personal problems/issues during his IELTS exam that may have brought down his score it'd be a plus to mention that s well)
Simultaneously he can also do the following-
a. Get a Reco letter from his College/University level English teachers attesting to his proficiency in English
b. A testimonial from a student how he has helped him/her in improving English
c. Basically any document that proves his English proficiency....
Seniors can also chip in with additional viewpoints...Good luck to your friend!!...I am sure he will sail through...