if I rejected in ECA than I am still eligible for merit based cut off admission

Hello student I request you to please help me with the college and course you're concerned about so that I can check and provide you with the exact information as admission process vary upon colleges and courses.

If you're concerned about Education credential assessment ECA - it's  to verify that your foreign degree is and other proof of your credentials are valid and equal to Canadian one

For more details refer to the link mentioned below - https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/express-entry/documents/education-assessed.html

Feel free to comment if you've any doubt.

Good luck