Highest aspirant,

Coming to your question rank to get admission in you said as you have mentioned in an OBC category must be under 7,000 to get admission as you have not mentioned the branch so I am not considering the branch preference.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/cusat-cat-cutoff/amp&ved=2ahUKEwiPrbmT8I7sAhXnwjgGHX42A7MQFjAJegQIHBAC&usg=AOvVaw3tzDVrTnM1JCrdeUnKVZav&ampcf=1

For more details you can go through the  cutoff through the above mentioned link.

Hope your doubt is cleared feel free to ask if you still have any doubt.