For ICET counselling, most universities and counselling authorities ask for the original certificates during the verification process, not just xerox copies. A photocopy usually will not be accepted unless it is specifically attested and allowed by the counselling authority.

Since you have already submitted your original intermediate study certificate to your degree college, you have two options. The first option is to request your degree college to give you the original back temporarily for counselling and then you can return it later. Colleges usually allow this if you explain that it is required for state-level counselling. The second option is to ask your degree college for a bonafide certificate or a custodian certificate. This certificate states that the original document is kept in the college and confirms its authenticity. Counselling authorities generally accept this in place of the original if it is attested by the principal with the college seal.

You should not rely only on a plain xerox copy, because during verification it will most likely be rejected. It is safer to get either the original or a proper custodian certificate from your college before attending counselling.