The eligibility criteria for the Diploma in Engineering courses changes from college to college. Although, if we are concerned with the eligibility criteria then in most of the college, the students needs to score 60% at least in order to be eligible for the course of Diploma in engineering. Now you are eligible for the course of Diploma in Engineering course, although you will get a seat or not based on the merit of ICSE 10th score is an question no one can accurately answer because, every year the density of marks applying for the admission varies. You have a decent score, and you have a moderate probability to get a seat. I would suggest you to see if there is any entrance examination available for the admission. If yes! then appear for the entrance because that will increase your probability of getting selected.

For more information regarding Diploma in Engineering consider the link below:

https://engineering.careers360.com/articles/diploma-in-engineering

I hope this helps. Wish you a great day!