How would it affect your studies? Pgwp is only available to you after you graduate and you meet the requirements of the pgwp.
Pgwp is not necessary for you to do your studies
No mention of why you need to spend thousands of dollars to go all the way to Canada to do a marketing management course. Those are every common courses you can take in your home country.
Changing course would seem to indicate that you're not going to care about studying. You just want a visa to enter Canada. You're essentially telling the VO that the choice of course is irrelevant to you.
You have to explain your choice. You can't just say "the course will help my career progression". It's very vague and unclear. How can the VO be convinced at all that you're a genuine student or not if you're not providing explanation?