Dear aspirant,

Based on previous year statistics, you will need a SC rank of less than 50 to get CSE on the top three IITs. Based on previous year statistics this comes about getting a general rank less than 5000. This is an arbitrary prediction based on previous year data and this is subject to change from year to year based on student performance and preference.

For more accurate prediction you can use the JEE advanced college predictor

JEE Advanced college predictor