Hello!

Different colleges have different criterias for admission in Diploma in Civil Engineering. The basic eligibility criteria is that the candidate must have passed 10th or High School Examination or it's equivalent of an approved board.Many Colleges ask passing marks with at least 40% to 50% in aggregate.

Some Govt. colleges and their requirement for admission are-

• Government Polytechnic, Pune
• Dr BR Ambedkar Polytechnic College, Gwalior- Admissions to the diploma programmes done through Pre-polytechnic Test (PPT), conducted by Professional Examination Board Bhopal
• Jamia Millia Islamia, New Delhi- Admission is through a combined entrance test conducted every year by the University. 

https://www.careers360.com/university/jamia-millia-islamia-new-delhi/diploma-in-civil-engineering-course

• Maharaja Sayaji Rao University of Baroda- On line admission through ACPDC on merit basis. The candidate should have passed S.S.C. (with Maths, Sciene and English)
• Aligarh Muslim University- Selection based on University Admission Test. 

https://www.careers360.com/university/aligarh-muslim-university-aligarh/diploma-in-civil-engineering-course

• Government Polytechnic College, Ambala- Admission is made on the basis of merit of Senior Secondary School Examination or equivalent qualifying exam. 

https://www.careers360.com/colleges/government-polytechnic-college-ambala/diploma-in-civil-engineering-course