• Cutoff is Something which is decided by CBSE Based on students Performance and taking all the mean,median values.
• Usually it varies from year to year based on total number of students written the test and to be qualified for advanced.
• From the past 2–3 Years morethan 1.8 Lakhs are qualified in 2017,2016 where as in 2014,2015 it is close to 1.5 Lakhs students
• So ,as Size Increases Cutoff would be Decreased,
• for this Year 2018, i believe 120+ is safe.
• Comparing from 2016 to 2017 Cutoff is reduced by 19 Marks

Hope this could help to an Extent.