College of Engineering, Pune

Check this on college predictor
https://www.shiksha.com/b-tech/resources/mhcet-college-predictor
good luck.

There are 80% chances that you can get admission here. Your percentage is good so, you can apply for admission.
Good luck.

NITK-Surathkal is far better than CSE branch in above mentioned colleges. You can also go for Manipal if you have enough money.

Yes, you can get admission in COEP with 85% in Diploma.
The minimum eligibility criteria for admission to B.Tech.(lateral entry) at COEP - College of Engineering is that a candidate must have completed Diploma in Engineering and Technology in relevant stream with a minimum of 45% marks from an All India Council for Technical Education or Central or state government approved institution or its equivalent.