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In 2016, SSC CGL Cut off for the post of Income Tax Inspector is 558.75. Ever year cut off is increased so, You should get at least 560–570 marks in final cut off.
SSC CGL Tier 2 Exam have 4 paper in which first 2 paper Maths and English compulsory for all type of post.
Paper 1 & 2 has 400 marks total in exam. You should score 350+ marks in tier 2 in Maths and English to get the Income Tax Inspector post. If you want to prepare for Maths, you can check SSC CGL Maths Notes.
And After clearing the tier 2, you must get 60–70 marks out of 100 in tier 3 so that you will definitely get ITI Post.
33% marks are enough for SSC CGL 2017 Tier 3. But to get the ITI post if you score 33% in tier 3 then you must get 370–380.
So, you should try to gt 350+ marks in tier 2 in 60–70% marks in tier 3.