Hello,

You can visit these links for cut off for just of both years -

https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.collegepravesh.com/cutoff/iist-thiruvananthapuram-cutoff-2017/&ved=2ahUKEwiQ99LGw4XcAhWKQo8KHQj5CsoQFjAAegQIABAB&usg=AOvVaw0LuBQUqK4ElMF0-3n5mXnz

And

https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.iaspaper.net/iist-cut-off/&ved=2ahUKEwiQ99LGw4XcAhWKQo8KHQj5CsoQFjAHegQIBBAB&usg=AOvVaw36c_pMW-XXzngkTqZXEksA

Go through the link given below for entire information about cut off ranks and details of IIST 

https://www.google.co.in/amp/s/engineering.careers360.com/articles/iist-btech-admission%3famp

Hello!!

Thanks 4 contacting Careers360...

Check it on..

https://engineering.careers360.com/articles/jee-main-cutoff-for-iiit-surat

All the best:)