Hello.

It's quite difficult to give you an accurate estimate of the marks you have to score to get into a particular college as it depends on various factors like difficulty of the exam, number of candidates attempting the exam etc. You can expect admission into these colleges with a rank of within 3000. Refer this link to check the previous year cutoffs:

https://engineering.careers360.com/articles/comedk-uget-cutoff/amp

Good luck!