Getting admission depends on multiple factors and marks is not a good parameter to predict a safe score. Instead you should focus on a safe rank.

Now from the  previous year data for CSE OBC candidate the cut-off rank was :

1. 2627 for home quota male students & 623 for other state male students in 2019 .
2. 7857 for home quota female students & 2295 for other state female students in 2019 .

So you should have a score under 3000 to have a secure admission with your quota.

For more data follow the link mentioned below:

https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-surathkal

Have a great eve!