Dear,

You need atleast 65–70% marks in JEE Advanced to get CSE in Top 7 IITs (However trend varies from one year to another). Here is a list of IITs with their CS cutoffs-

1. IIT Bombay- AIR 62
2. IIT Delhi- AIR 104
3. IIT Madras- AIR 177
4. IIT Kanpur-AIR 208
5. IIT Kharagpur-262
6. IIT Roorkee-449
7. IIT Guwahati-670
8. IIT (BHU) Varanasi-935
9. IIT Hyderabad-975
10. IIT Indore-1500
11. IIT Gandhinagar-1736
12. IIT Ropar-2029
13. IIT Mandi-2587
14. IIT Bhubaneswar-2695
15. IIT Patna-3298

These are JEE advanced ranks. However, the trend varies every year.

Hope this helps!