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I think, now SSC CGL 2017 Tier 2 will not shift. But confirmly no one says that CGL Tier 2 exam will be shifted or not.
According to the latest notification, SSC CGL Tier 2 Exam will held on 18–20 January 2018.
So, you should start your preparation of tier 2 according to the January exam and get the good marks.
You can take help of SSC CGL Maths notes for the preparation of Tier 2 maths.