Actually previous education and work experience should be considered as additional credit for an applicant.
It is already frustrating for this applicant to discover the bad outcome of not being transparent. Some lose the points for the foreign experience because of that. In this case, to be truthful, this applicant should clarify this point otherwise it will always be hidden and uncounted. Besides, they will review the application before canceling it, so this will be registered anyway. Any change in the future will cause discrepancy, therefore, it is better to come clean about why you omitted it in the first place.
The question for BeautyZino.... Did you apply for a Study permit on your own or through an agency?
When I first wanted to hire an agent to apply in my stead, I noticed that the agent messed everything up, I am glad I noticed that before submitting, I ended up doing everything on my own since then. Minor innocent mistakes or typos happen, but they acknowledge that. With the agent, it was like trying to write the least.