As per my knowledge PEBC would be possible after landing in canada
rest u confirm
You don't need to wait landing to Canada to take PEBC Evaluating exam. You can do it in London, UK, while waiting your PR visa to Canada. Of course if London, UK, is closer than Canada to you.
From PEBC Doc evaluation info booklet:
Please note: There is an additional administration fee of CAD$365 for the London, England site of the Evaluating Examination.
London, UK is only place outside Canada where PEBC Evaluating exam is hold.