When I was studying for my CELPIP exam I got material from them. Unfortunately, I can not put the PDF to the public because it has a watermark with my personal email. But I can put you here what it says.
CELPIP's eighteenth error as they state:
A common CELPIP error is failing to use a period when necessary, which leads to run-on sentences (see Unit 2: Run-On Sentences) and a confused reader. A test taker who is unable to use periods effectively may produce responses that are harder to read and that may not communicate ideas clearly and effectively, resulting in a lower rating. A test taker also needs to be careful to use question marks in true questions only and to limit their use of exclamation marks to sentences where it is appropriate to communicate surprise, shock, or other strong emotions.
Always use a period after an abbreviation such as Dr. (doctor), or etc. (etcetera). If an abbreviation is the last word of a sentence, do not add another period.
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