There are 2 trails in ECA , Preliminary and final trail are both trails on same day or different .

Hey Divisha

All DU colleges need to offer seats for admissions under ECA quota. Every year, each DU college offers not more than 5% seats under ECA quota (subject-wise).

Candidates who apply for admission under ECA quota need to take part in trials. Applicants are informed that dates for preliminary as well as final trials will be displayed on Delhi University’s official website.

The ECA certificates of only those candidates are evaluated who qualify for the final ECA trials. Candidates are advised to carry all their relevant certificates on the day of the trials. The original as well as self-attested photocopy needs to be carried by students at the time of the final trial.

ECA Trials:  DU conducts the trials at two levels – Preliminary trials and Final trials.

Candidates would be allowed to appear in the preliminary trials of any event only once. Any request for a second chance of trail will not be permitted. The dates for preliminary as well as final trials would be displayed on DU’s official website, the college website as well as the college notice board.

DU colleges will make a video of the preliminary and final trials. These videos are preserved till the last date of admission.

For more details visit

https://www.google.com/amp/s/university.careers360.com/articles/delhi-university-admissions-good-in-sports-and-eca-avail-quota/amp

Good luck!!