repost

According to Immigration Canada's Manuals and Operations Memoranda for outside Canada processing:

*******************************
Any concerns officers have regarding the accuracy or authenticity of information or documentation
should be communicated to the applicant, whether these concerns are raised as the result of site
visits, telephone checks or other means. Concerns can be communicated to the applicant in
writing or at interview.

Officers may conduct interviews with applicants to:
• ensure that information submitted on the application is truthful and complete;
• detect and deter fraudulent information and documents;
• clarify specific information;
• conduct quality control.

Officers may not conduct interviews to:
• assess language abilities;

Visa offices will be expected to undertake both targeted and random verifications to detect and
deter fraud. The number and percentage of cases subjected to verification should be high enough to
act as a meaningful disincentive to those who would attempt such practices.
*******************************

Interview is used to make sure that your application materials are real and complete. If you can't pass 67 mark because of your poor IELTS score, the immigration officer may ask you to re-take IELTS or deny your application directly.

In practical, immigration officer may conduct interview to re-evaluate your case. However, don't count on it.

For more details, please visit:

http://www.cic.gc.ca/manuals-uides/english/op/op06e.pdf