Unusual rating increase

I was randomly going through one of my senior’s profile and found that even after not solving a single problem correctly he got a rating increase of about +160 and got promoted to 4 star in last year’s Nov challenge . Can anyone explain me this.

PS:i am not obsessed with anyone.i am just wondering.

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Your senior did solve problems, but was probably caught of plagarism so his solutions are removed and ranks dropped.

P.S - You shouldn’t bring any user’s name in these things on a public fourm.

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OK. I have removed his profile link. But as far as I have seen rating goes down in case you are involved in plagiarism.so,how it’s possible?

It will go down, Codechef takes some time

A year? As far as I have seen it is as fast as 1-2 months or even faster.