Hello,
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First possibility is, placements list may be of 2 academic standards.
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2nd possibility is placement list is including all the branches.
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3rd possibility is placements have been mentioned according to the highest numbers of students placed till date at a time.
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So, unless you are a student of the particular college and gets placed into a company, you won't understand the placement reviews of the college. So, as you said, you got the information from official website, information will be true with a different concept involved